Mabel turns the corner to see the monster grab the jar of money and throwing the cash into its mouth.
"Our profits!" Mabel yelled as she ran towards the monster."Stop stop!"
The monster looked down to see Mabel shaking her hands in the air. It grabbed her and lifted her into the air.
"Don't look into its evil eye, you'll see your worst nightmare!" Dipper instructed Mabel.
"I wish we had an evil eye to show him." Mabel said as she looked at the monster directly in its eyes. "Oh no!" Mabel yelled as her eyes turned yellow.
"Mabel! Uh, uh…" Dipper said while trying to think of what to do. "Uh… Mabel! Look away if you can!" Dipper said with no response. Dipper frantically was trying to think of something, he was about to try to attack the monster, before he thought of something that wouldn't lead to certain death. "Hey monster!"
The beast looked down at Dipper. "Take a look at this!" Dipper said as he pulled a mirror from his vest.
The monster looked at the mirror for a few seconds before screaming and smashing through the wall and flew away.
"Mabel! Are you okay?!" Dipper yelled as he ran at Mabel who was sitting on the floor staring into space.
"Mabel! Please tell me you're okay, say something to me Mabel!" Dipper yelled as he shook his sister.
Mabel looked at Dipper, her eyes now back to normal. She looked at Dipper with her eyes widened. She started shaking frantically. "DIPPER!" Mabel yelled.
"Ma-" Dipper said as Mabel tackled him in a tight hug. "Mabel! Are you okay!?"
Dipper got a response of a strong sob. Mabel hugged him tighter. Dipper hugged her back.
Dipper decided to not say anything. He knew that whatever Mabel saw, it must have been horrible for her to be like this. But he was relieved that she wasn't panicking on the floor like the other people who saw the monsters eyes.
After a few minutes, Mabel said, "Dipper, promise you'll never leave me."
"What do you mean?"
"Just promise me, please."
"... I promise"
…
"Mabel?" Wendy said as she looked through the giant hole in the wall to see Mabel crying a river on Dippers shoulder.
"What's wrong Mabel?" Soos asked.
"She looked into a monster's eye and she saw her worst nightmare." Dipper explained.
"Wow! Mabel, how are you doing with… that" Wendy said as she walked behind mabel and put her hand on the back of Mabel's shoulder. Soos sat next to her.
Mabel didn't loosen her grip on Dipper.
"Mabel, if you're feeling okay, what was it that you saw?" Wendy said.
"I don't think she's ready yet." Dipper said.
Mabel'sperspective:
Mabel opened her eyes to see a dark sky. She didn't remember what happened, but she felt that something was wrong. She turned her head to see Dipper laying against a tree, and had about a hundred deep cuts all over his body.
"DIPPER!" Mabel yelled as she jumped next to him. Dipper looked at Mabel.
"Dipper what happened!?" Mabel sobbed.
Dipper's bloody eyes slowly closed. "DIPPER!" Mabel yelled as she shook Dipper frantically. "Please Dipper, wake up please!"
Mabel, now holding Dipper, heard his heartbeat slow, and eventually stop.
Mabel was now crying the most she had ever had before. Her twin, her half, her best friend, was gone.
…
Mabel opened her eyes to see a wooden ceiling. Her heart was racing.
She turned her eyes to see Dipper on her side, yelling her name.
"DIPPER!" Mabel yelled as she jumped into Dipper.
AN:I did steal the "I promise" part from a comic I saw a while ago, I have no clue who made it but I changed the context.