Rated M for strong violence and gore.

Disclaimer: I don't own Grey's Anatomy or its characters.

"Dr. Torres? Were you aware of Addison's return?"

Callie looked up from her paperwork and noticed Dr. Derek Shepherd leaning in the doorway of the staff lounge, his arms crossed. Addison came back from Los Angeles already? She was only gone for two months. Callie smiled.

"No, Dr. Shepherd, I had no clue she was coming back."

Derek grinned. "I thought you two are best friends."

"'Were' is more like it. She never told me she was leaving Seattle and never returned my calls, so I have no clue what we are now." She closed her binder and stood. "Where is she?"

"Last time I checked she was with the Chief. Good luck." And with that Derek left.

Callie Torres travelled across the hospital to the Chief's office just in time to catch up with Dr. Addison Montgomery as she shut the door behind her. She was wearing a small black dress with matching black stilettos and her hear was pulled back into a French braid. Callie reached out to tap Addie's shoulder but before she even touched her, Callie's hand was crushed by Addison's right fist. Callie was amazed at the fact that even though Addie was facing the other direction she was able to locate Callie's hand behind her head. Must've been a freak coincidence. Addie turned and when she realized that the hand belonged to Callie, she dropped it.

Callie rubbed her right hand with her left and winced in pain. Her hand had already begun to swell. "Jeez Addie! Were you working out or something?" She clenched her right hand repeatedly to try to will the pain away. "I think you broke my hand!"

Addie lifted her hand to her face and stared at it absentmindedly before responding. "Oh! Um, yeah, I was doing Pilates in LA." She lowered her hand and cocked her head to the side. "I hear you are the Chief Res here?"

"Yeah, I am. It's a lot hard-"

"Could you lend me one of your residents for my hysterectomy tonight?" Addison's face started to twitch nervously.

Callie looked at her binder for an available resident. "Let's see…Dr. Stevens is open for the rest of the night. You can take her."

Addison spun around and started to leave. "Have her meet me in the on call room at 8 PM," she called over her shoulder before she disappeared into an elevator.

"Um…ok…" Callie softly said to herself as she left for the staff room. She beeped Izzie and told her where she was assigned as she walked. Why was Addison acting so weird? Why didn't she want to talk to me? Many questions filled Callie's mind as she entered the lounge and laid down on the couch. She felt that a nap was in order and she shut her eyes.

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The shrill tone of the hospital alarm caused Callie to spring of off the couch, spilling her binder onto the floor. She looked out the window and noticed hospital workers sprinting down the halls, panicked, their faces white in horror. Callie opened the door and hollered out to Alex Karev as he herded his interns in front of him.

"Karev, what the Hell is going on?!"

"There was an animal loose on the fourth floor. We got a MASCAL situation!"

Callie joined the fray of people and continued to converse with Alex. "Why are we evacuating? Shouldn't we go and rescue the survivors?"

"The animal is still up there! It killed Izzie!" Alex ran ahead of Callie and continued to help people keep up. Callie stopped dead in her tracks as the flow of people split around her like a river around a rock. A resident died on her watch. Without thinking, she sprinted against the terrified nurses and doctors and ran up the emergency stairs to the fourth floor.

The glass window of the door was smeared with a bloody handprint and spattered with specks of fresh blood. Callie carefully opened the door and a partially headless corpse fell to her feet. She leaped back against the wall of the stairwell and screamed. She quickly covered her mouth when she remembered that the animal was reportedly still hiding on this floor. She slowly walked over the body into the surgical wing and started to gag when the stench of copious amounts of gore and blood hit her senses. Along the wall to her right she spotted three nurses, their bloodied bodies slumped to the ground, their intestines spilt and their limbs torn from their joints. The windows to Callie's left were almost all broken, save for two that must've been spared.

She continued down the hallway, careful not to step in the puddles of blood or trip over a random limb. As she neared the on call room, she noticed a pair of light blue scrub adorned legs sprawled into the hallway, the rest of the body hidden from view. Callie knew this had to be Izzie and when she arrived at the room, her heart dropped at the sight of Izzie's body lying on the on call room's floor. Her throat had been ripped out but she still seemed to be in better shape than the four corpses Callie had seen. Izzie's death had been quick; she bled out in a matter of seconds. Callie reached down to pick up Izzie's body, but she heard someone's raspy voice in the doorway behind her.

"Don't pick her up! This is a crime scene…or something." The voice belonged to Mark. Callie turned to him and was shocked at how injured he was. His arms were covered in deep lacerations; he had wrapped his arms in yards of gauze to slow the bleeding. Blood flowed freely from his nose as he spoke. "I think that beast is gone. That bitch bit me!"

"Shhh, let's just get out of here." Callie stood upright and began to lead Mark into the hallway when he spoke again.

"No! Addison's up here somewhere. I can't leave her."

Callie dreaded the thought of her friend ripped to shreds and shuddered to think that the corpse at the stairwell doorway could be Addison. She glanced down the hall at the headless body and sighed a sigh of relief that it was a man. "She probably made it out ok. She's probably downstairs in the parking lot waiting for you. Come on, let's go."

Mark reluctantly followed. As they neared the headless man they heard a small cry for help behind them. "Pleasssse hhhelp." The two turned and faced a bloodied and naked Addison who was dragging herself across the floor, her legs leaving a trail of crimson behind her. Her body was covered in cuts and bruises and blood poured from her mouth.

"Oh my God! Addie!" Callie screamed as she ran to her side. She removed her lab coat and draped it over Addison's shoulders. "Can you get up?"

Addison wheezed and nodded her head. Callie pulled her to her feet and both she and Mark led her out of the bloodbath of the fourth floor. When they exited the hospital they were swarmed by the press, the flashbulbs blinding the trio. Callie could hear reporters yelling questions, but she couldn't comprehend anything but the sound of her breathing within her own body. Soon the paramedics broke through the crowd of reporters and took both Mark and Addison away to one of thirty or so ambulances in the lot. Callie continued on through the crowd, the mass of people a surreal cloud of flesh and lightning. She strode on, to where she had no clue, but she didn't want to be here.

A male police officer appeared in front of her and took her by her hand. Callie floated along with the man, not knowing nor caring where he led her. She found herself in the back of a squad car and within seconds, she was moving away from the Seattle Grace lot. People were watching her leave, faces still blank. As the car sped away, she could see the SWAT team charge toward the hospital, guns drawn and helicopters hover overhead, directing their lights on the walls of SGH. That was the last thing she remembered before she blacked out and fell to the cool leather seat of the squad car.