Woohoo! The Big 5-0 so i thought i'd comment. Thanks for all your comments guys :)

Mark had ran after Milo but lost him through all the crowd. He knew that Meredith had to find out about this even though he had promised his 'best friend' that he wouldn't tell. He sighed and ran his hands through his hair. He went back to his office and paged Meredith. She arrive a couple of minutes later and walked into his office.

"Hey" She smiled as she closed the door behind her. "Where's Milo?" she said as she scanned the room.

"He ran off. We need to talk Mer" Mark said as he approached her.

"What happened to him?" Meredith quickly panicked

"He's fine Meredith Grey"

"Then why do we need to talk?" Mark took her by the hand and lead her to the sofa where they both sat down.

"What's going on Mark?" Meredith asked concerned

"How do I say this… Addison's being a bitch towards Milo but he didn't want me to tell you because he was scared that you'll be upset"

"WHAT!?" Meredith shouted and stood up. "That's it. That bitch is so gonna get it" Meredith shouted again. She was full of rage, how could Addison be mean to her son.

"Meredith, calm down" Mark said holding onto her wrists trying to make her sit back down.

"I can't calm down Mark. I can't stand her no more"

"Meredith…"

"I'm going now. I'm going to get this sorted" Meredith snatched her hands away from Mark and stomped towards the door. Mark ran after her and caught up with her.

"What are you planning on doing Mer?"

"I'm gonna beat the shit out of her!" Meredith shouted.

"No, don't fight" Mark said. She was walking extremely fast and Mark was jogging next to her. The nurses yet again had started to gossip and whisper to each other.

"We are way past talking!"

"Meredith, this is a bad idea"

"I know but she needs it!"

"Shhh" Mark said trying to make her lower her voice so less people would stare.

Cristina saw a glimpse of Meredith angry and Mark trying to follow her and ran after them. When she reached them she turned to Mark and said,

"What did you do now McSteamy?"

"I didn't do anything. She's gonna beat up Addison. Tell her not to fight Yang"

"Meredith? Seriously?" Cristina grinned towards Meredith

"Yes!"

"This should be interesting" Cristina said with a grin still on her face

"What are you doing Yang?" Mark asked concerned

"Supporting her, if she wants to beat up she Shepherd I need to see"

"Thank you Cristina" Meredith said in a huff.

"Yang!" Mark shouted and took hold of her wrist, "Stop her" Mark pleaded. She took her wrist away from Mark and gave him an evil glare. Before they knew it, Meredith had stopped in her tracks. Mark and Cristina looked up and there stood Addison at the nurses' station.