There's a lot of P.O.V changes in this one so don't let yourself get too confused.
The changes were taken straight from the show (mainly for my sanity during the writing stage) so I will repeat what is said in the summary;

I Do Not own Once Upon A Time or it's Characters, I just own my OC (Watcher).

Another Musical chapter this is.

Enjoy it I hope you do.

R

(Music: Bassnectar – Calling From Above (Edit))

P.O.V. Change

David walked down the street talking to Mary-Margaret on the phone "Hey. I just talked to Emma..."

P.O.V. Change

"It's a bad wound, she says it's poison"

Mary-Margaret twirled an apple in her hand, slightly reminiscing on her history.

P.O.V. Change

"He can only cure it back here in Storybrooke"

Regina and Cora listened in through a phone tap.

Watcher sat at her door with said door wide open.

"If you've got all this foreknowledge, now's the time to use it for the right reasons" Johanna Conscience told her as she thought on her escape route.

"They're taking the ship home"

'So Hook's stuck in The NY with Tamara. Neil's on his way with the rest of them. Which means...'

Mary-Margaret started to talk "Well, let him know that they have the knife, okay?"

Cora and Regina looked at each other.
Cora with one hand crossed across her waist and the other leaning on the crossed one with her hand over her mouth, maybe still a little shocked considering she had never seen or heard an electronic speaker before.

P.O.V. Change

Mary-Margaret stared at the apple in her hand "Who knows what that wicked woman would do"

P.O.V. Change

Cora knocked the speaker off Regina's desk quite effectively destroying the tap.

Regina realised too late and let her know with an annoyed "Mother!"

She moved around her desk to pick up the speaker and see if it could be fixed.

"I don't like what that enchanted box was saying. I'm not...I'm not wicked" Cora said almost sadly, but Watcher wasn't fooled

"Could've fooled me" she said so loudly.

Regina sighed closing her eyes, half expecting hell to break lose, but her mother remained calm and said nothing to her youngest daughter, but only stared at her sadly for a moment. Watcher not even regarding either of them.

Regina moved forward with the conversation

"It's not an enchanted box"

"It's a phone tap" Watcher finished for her.

Regina looked over to her sister sitting in her enchanted doorway, her smile hidden "Not funny"

Watcher held up her hand, positioning her fingers as if to say '"A-Little-Bit"'

"I don't care!" said Cora "What matters is , they've been warned. Rumplestiltskin's smart, and now he has time to think"

'You only know he is coz you love him' Watcher thought

"But he's injured" Regina put in.

Cora noticed something on the Dagger "More than injured, I'd say"

She picked up the Dagger "He's dying"

She showed a shocked Regina the Dagger.

"And when his name disappears, all of that power of his will just boil off into the air, and there will be no new Dark One"

Watcher mouthed along with her on these last few words.

Regina looked at her mother remaining as calm as possible "Okay, so we have to use him to get Henry back before he dies"

"Not in his condition. I don't wanna kill him faster. No, there are no other options. I have to stab him with this knife and take his power as my own. I have to become the Dark One. And-"

"Yippee for us" Watcher said sarcastically

"I am getting very tired of your attitude" Cora stated "And, frankly, it hurts me!"

"As if"

"The first thing I'm gonna do when I become that Dark One is fix that moth of yours!"

"Oh, bite me!"

Regina sighed and rubbed her temples as the two bickered.

"Why would I do that?" Cora said evenly "It would be awful"

"But it wouldn't be as bad as me biting both of you!" Regina shouted angrily.

The other two stared at her until Watcher turned away again and Cora said a small "Sorry dear. Anyway was I was saying - and with his power, there's nothing I wouldn't be able to do"

Regina's fear and recognition showed.

"But Henry's never going to forgive that" Regina said as she stood from her chair.

'He definitely won't forgive it considering he's found out Gold's his Grandfather now' Watcher stated to herself.

She noticed Regina had walked around her desk to Cora.

"And the whole point of this is...wait, what is the point of this?"

Watcher chuckled to herself.

'She's only just figuring this out now?' Johanna Conscience said with a chuckle.

"Could've just asked me, but then where would be the fun in that?" said Watcher loudly.

"Smugness isn't a good look on you little sister!" Regina shot.

Watcher, chuckled for a third time and held up her hands in defeat.

"The point of all this mother?" she provided, Cora stepped toward Regina.

"To protect our family"

Regina looked at her mother skeptically "Or you gaining your power?"

Cora stared at Regina with a face that said she was thinking of an excuse, before she smiled and tried to sound convincing "Whatever power I gain is for us"

Watcher scoffed lightly as Cora continued.

"To protect you. To protect Henry. And yes to protect your sister"

Watchers eyebrows moved upward at that statement.

"If we lose this battle, we'll spend the rest of our short lives on our knees in front of them. And that, my love, is something I'll never do" she finished and she exited the mayor's office leaving Regina to look at Watcher confused and expectant.

Watcher kept eye contact for a moment.

She shrugged "What?"

Regina gave her an expectant look.

"Oh! That" Watcher pointed to the door "I don't think it's my place to say"

Regina sighed exasperatedly and threw up her hands then moved back around her desk to try and fix the speaker.

P.O.V. Change

Emma and the N.Y gang had just docked at Storybrooke Wharf and David and Neil had help the struggling Rumplestiltskin to lean on the back of David's truck.

"Is Cora trying to control you with the Dagger?" David asked him.

"Well, you'd know if she was, because most of you would be dead by now" Gold said thoroughly annoyed. He didn't want to be bombarded with stupid questions as soon as he had gotten back, and he knew Cora would know about his condition by now, she was smart that way.

"Well then, we'll just have to take the fight to her before that can happen" Mary-Margaret said.

David sighed like he'd heard all this before "We will"

"And this time, we finish it"

"Mary-Margaret..." David tried

"David. She needs to be stopped. She needs to be killed. This is our family. We are going to protect it. And we need to save Watcher! Who knows what that woman is doing to her!"

"Of course we will" David said, but Mary-Margaret's previous statement and caught the attention of Rumplestiltskin and Emma.

"If Cora has Watcher we may have already lost" Emma said panicked.

"I agree. She may not intervene, but she could've told Cora anything" Rumplestiltskin strained.

"What d'you mean?" asked Henry. Gold sighed in pain as David pulled Mary-Margaret away to try and convince her not to taint her heart.

"The Watcher knew what would happen with Belle. And she didn't say or do anything to prevent it" nothing more was said about Watcher after that.

Emma approached Gold a minute later with a few blankets in hand "You okay?"

P.O.V. Change

Watcher was seated on the floor at her door, her sister on the other side in a comfy looking arm chair.

They had run out of things to talk about and were now sitting in awkward silence.
They had had a lengthy conversation about Henry, Watcher had told her story and Regina had told Watcher what she knew about their childhood back in the Enchanted Forest.

Watcher stared at the door frame for a while before something came to mind "Hey, you said that I have magic right?"

"Yes..."

"How come I've never known about it until now?"

Regina took a moment to think "I can't really explain it, but it might have something to do with you crossing the town line into a place with magic"

"But I've been in other magical dimensions, and I haven't had any uh... problems, I guess" Watcher told her.

Regina thought again for another minute.

"Maybe, it wasn't the right kind of magic, from the right magical dimension"

That made sense to Watcher. Then something came to mind;

After her fight with Regina, she'd almost killed Mary-Margaret. But throughout that whole fight, something felt different, something felt wrong. It wasn't bloodlust, but it was definitely more powerful.
It scared her more so because she couldn't remember anything toward the end until Mary-Margaret called her.

"Do you think you can teach me how to control it?" she asked her big sister.

Regina's face softened into a smile "Of course! What do you wanna learn first?"

"Well what do you suggest? You've been doing this longer than me"

Regina sat there for a moment before she got up and went to her desk. Opening a drawer, she pulled something out and sat back down in front of her sister.
She showed Watcher a metal ball, nothing special really.

"I want you to move it. Now, usually what would happen is, I would put it under something and you would have to summon it to you. But seeing as I can't summon it out of your room, we'll have to settle for you moving it from one of my hands to the other"

"But if you wouldn't be able to summon it out, what makes you think I'd be able to move it from in here?"

Regina's smile never faltered "Because I have faith in you. And I saw what you did to mother"

'That's good, 'coz I don't' remember it!'

Watcher stared into her sister's eyes "So what do I do?"

P.O.V. Change

"Invisible Chalk" said Gold.

Emma looked down at her empty fingers. Her mind expressly told her that she wasn't holding anything, but she could feel the solidity of it between her index and her thumb.

"Use it in the front doorway" Rumplestiltskin continued.

"Draw a line" he grunted at her "The rest of you? You might want to prepare for battle"

Emma left to do as she was told, David followed her out and Neil looked at his father before following David.

However as Mary-Margaret went to leave Gold called her back "Oh! Oh, wait, wait, please" she turned back to him.

"Can you get me a warmer blanket?" he pointed to a cabinet "from that cabinet"

Mary-Margaret moved to the cabinet, wanting to be out of this man's presence as soon as where she expected to find blankets, she found a candle.
A black and white candle that could be lit at both ends.
The same candle that Cora, disguised as the Blue Fairy, had given her as a child when her mother was dying.
A special candle that could give life back to someone who was dying, by sacrificing anothers.

She held it in her open palm as she turned back to Rumplestiltskin, who observed her in silence, awaiting the inevitable flow of questions to begin.

"Why do you have this?"

he breathed in heavily as his hand shook on his cane "For a rainy day"

They stared each other down, Mary-Margaret almost in tears as her memories awoke, yet again, like a daemon from hell.

Meanwhile, at the front of the shop, Emma kneeled down at the door to draw the invisible line in the doorway.

P.O.V. Change

Regina and Cora had left Watcher on her own.

According to her sister, it had taken her months to be able to summon something hidden from view, within a few hours Watcher had movement down pat and could summon things to her quite easily after that.
Regina was extremely impressed...and a little jealous, but she wasn't going to say that out loud. And she obviously thought Watcher hadn't been able to tell.

Watcher had also had a lengthy argument with her mother about her plan, telling her that she hadn't thought it through completely and that she couldn't perceive the consequences.
Cora only told her that she'd perceive them when they reared their ugly heads, that her plan was fool proof and that she could handle it all...seeing as she was the powerful one in this situation.

At that precise moment, Watcher was trying to summon something.

There was a small puff of silvery purple smoke and her device sat on the table in front of her. She squealed with joy, something she didn't really, usually, do.

'This thing is never leaving me again!'

Next thing she attempted was the bag she'd left at Rumplestiltskin's house, it took a half an hour but it ended up being successful, her sister would be green with envy when she found out.

She recalled those specific words 'green with envy' when she remembered future events.

She pulled on a jacket and pulled out the remote headphones, stuck her device in her pocket and moved to the door.

"Now to try something more difficult"

"Good luck dear"

She moved her hands up in front of her, palms facing to the doorway and her mother's spell. She closed her eyes and concentrated, felling her mother's power radiate back to her, a slight tingle and hum to it.
With her mind, and magic, she pushed. Hoping to break the spell.

She struggled, for about a minute until she was forcefully thrown to the floor sliding about a meter away.
She stood up and tried again, only to have the same results, but she was determined to get through.

"Remember what your sister said. Magic is derived from emotion. Remember when you fought Regina? What were you feeling when you used your magic on Cora?"

"I was determined to protect my friends when I fought my sister and I was angry at Cora for killing you and hurting them" Watcher said

"Then get angry. Or use your determination and strength. Use your smarts"

'Get angry, huh? Remember the fight. I cant's use the Nanos, they'd be fried on impact. That force field is designed to keep things in'

"What if I were to weaken it whilst I tried to break through? But how would I go about that?" she looked around the room, there were a number of dishes and smaller things that could be thrown, but that might get messy...it was worth a shot.

She picked up a number of things and started throwing them at the doorway, letting her frustrations and anger fuel her. Sparks and shards flew everywhere.

She remembered what Mary-Margaret and the others had told her about Cora and her sister, she remembered the feeling to survive when she had fought Regina, her fearlessness, she remembered the sickness she felt when Cora told her that she was her mother and the anger she felt later when Cora had choked her, she wanted to protect them all, even her sister, from Cora.

Nothing happened.

No matter how hard she tried to remember and grasp her emotions she couldn't shift the force field.
She threw the last thing screaming, then moved to wall and slid to the floor. She put her headphones on and flicked on a song from her device.

(Music Start)

She looked over to the doorway again.

"No. It won't end this way"

She was more than determined to break free, she would not be a bird in a cage!

Clearing her mind she leaned her head against the wall resting her arms on her bent knees, palms facing up.
Closing her eyes she thought to herself 'Why am I doing this?'

She breathed deeply a few times keeping her mind clear and at the same time, willing the force field to break.

She saw a closed door in her mind's eye, she understood now. She needed to will the door to open, or at least a figment of it.

There was a low rumble and the shards and things around her started to rattle and shake.
Her hands slowly moved beside her, palms to the floor, as a light tingling reached her fingers.

There was a creaking and cracking, but she dare not open her eyes for fear of losing the moment.
She also heard what sounded like something sparking over near the doorway.
She felt a pulse of magic move out away from her and, in her mind, she saw the force field dissipate and the door blast open.

She opened her eyes and looked toward the doorway.

The frame had broken and bent at all angles, and her eyes traced downward, noting that the cracks and breaks in the floor lead back to her.

'It looks like something was trying to break through the floor! And did so through the door!'

She didn't linger on that thought and proceeded to pick herself up off the floor and dash to the doorway, carefully stepping through and doing a little victory dance at her success.

She changed her song and ran, she knew where she needed to go and hoped she wasn't too late.