Mark was trying so hard to catch up with her, but she had a good headstart.

He saw her running towards the road, so tried calling out to her again.

"LEXIE!"

And there it was.

A car was coming directly for her and she didn't even know.

Mark saw her body fly about 5 feet into the air and land hard on the gravel. Another one bumped her body and Lexie skidded on the road.

"Oh my gosh, sweetheart! I didn't even see you!" The first person who hit her was a woman who came out of her car and began calling 911.

The second person was a middle-aged man who was just as worried. They were both trying to get emergency services there as soon as possible.

Mark rushed towards her. There was a lot of blood around her skull area, and she had many gashes. Something was bleeding out in her lower body area and he concluded that her it was her pelvis.

After waiting a good 5 minutes, ambulences and police cars arrived. It didn't happen very far from the house, but Mark knew Meredith didn't know..and he had to be the one to tell her. He had to be the one to tell her her sister was on her way to hospital because of him.

"Excuse me, sir? Are you coming or not?" A fellow paramedic asked. They were able to get Lexie stabilized but they needed to get to the hospital immediately.

As much as he wanted to go, he knew he needed to inform Derek them.

"Uh..n-no. I'll meet you there. What hospital?"

"Seattle Grace."

Mark nodded and rushed back towards the house.

"Meredith, Derek! We need to leave!"

Meredith was the first to look up. "Why? What happened?" She scanned the room looking for her sister. "And where's Lexie?"

"S-she u-um, s-she's i-in t-the a-ambulance..."

"WHAT?!"

Derek was the next to butt in.

"What do you mean?! What happened!"

"S-she u-uh s-saw A-Addison and I-I t-together..." he took a deep breath before continuing. "...and she ran out. I tried catching up to her but it was too late..." tears started running down his face. "S-she w-was h-hit b-by t-two c-c-c-cars a-and I-I...I'm sorry!" he was now sobbing.

Everything that had happened and was going to happen from here on out, was entirely his fault. If he had just kept it in his pants long enough...

"MY SISTER GOT HIT BY A FUCKING CAR BECAUSE YOU COULDN'T STOP BEING A WHORE!?"

Meredith rushed up to hit him but Derek caught her just in time. She tried kicking and scratching but Derek wouldn't remove his grip. He knew she could do some damage if he did.

All of a sudden, a door closed and out came Addison.

Meredith's immediately turned to the staircase and her eyes darkened. Derek noticed this.

She was out to kill.

Without even realizing, he accidentally loosened his grip and Meredith charged towards the red head.

When she reached her, she started hitting and kicking, and cussing extremely loud.

Addison was crying out for help but Meredith didn't care. She part of the reason her sister was in the hospital right now, and she was gonna pay.

She grabbed Addisons head and began slamming it on the wall.

Both men rushed to tear her off the red-head.

Meredith kicked and spit on her. She was proud of herself. Addison was bleeding out of her mouth and nose, there were scratches that looked like claw marks going down her eyes.

"Meredith! Meredith, STOP!"

"I hope you burn in hell, you fucking bitch. If anything happens to my sister, I'll kill both of you." she told them, looking between Mark and Addison.

"Meredith..babe, it's time to go. Let's go see Lexie.." Derek soothingly told her.

Mark felt obligated to do something. "I'm gonna take Addison to the ER and get her cuts cleaned..."

"Yeah Mark, you do that!" Meredith spat. "And don't you dare ever fucking come near my family and I again."

Derek led her out the door and put her in his truck. As much as he wanted to hate Mark right now, he needed to focus on Lexie.

Little Grey was like a sister to him now and he considered her family. She was always so sweet, loving, and caring.

But he remembers specifically telling Mark not to hurt her, and that is exactly what he did.