Sam
He peered around the corner and quickly ducks back as he spots Dr. Fuller. He was looking down at a clipboard; Anna's patient chart. He wondered why Anna was isolated; all alone in the west wing of the hospital.
The he realized that it must be arranged like this to make feeding on her easier. Rage filled him as Sam took a deep breath, gripping the silver plated knife in his hand tightly. He only just found her alive again, broken and insane, but alive. He would not lose her, would not fail her. Not like he'd failed Jess, or Jo or Ellen or his dad or even Dean. He wouldn't fail her. Not this time.
He lunged around the corner, the knife slicing down into the doctor's arm. With a yell, Dr. Fuller reeled back, and orderlies rushed to restrain him. Sam swung his fists, throwing one orderly into a wall, and the other through a window. He lunged forwards, snatching up the dropped knife.
He raced down the hall, following the sound of pounding footsteps, single mindedly focused on killing the wraith. Sam caught up quickly, and tackled the doctor to the ground. He raised the knife into the air, intent on stabbing it straight down into the tweed covered chest when a cold hand catches his wrist.
Sam glanced back in surprise to see Anna holding his arm, her thumb digging into his pulse point on his wrist. Pain began to shoot up his arm as he wrestled with her, trying to get the knife away. Cold silver eyes flashed in the dim hospital light.
"Anna, please I gotta do this." Sam muttered, but she shouldered him off the doctor. Picking up the knife she drops into a defensive crouch, but as Sam rises up again she lunged at him. With fast, violent movements she struck, hitting him across his chest and arms with small fast punches before dropping down to sweep his legs out from under him. Stumbling, Sam backed up quickly, working hard to defend himself. He couldn't do much more than try to protect his face and vital organs, as her hits came hard and fast, winding him.
Sam had only ever seen Anna fight full out once, and that was the night in the cemetery in Wyoming nearly three years ago. But even before then, Sam had known that Anna was a better fighter than him, better than Dean and probably even better than their dad. But this, this was something else. It was like all the intention she'd once carried in every motion had been stolen from her; leaving nothing but speed and power and raw skill. The fluidity of her current movements betrayed the numb stumble she'd walked with earlier in the day. Like she was a different person entirely in that moment. The hunter she used to be was back in the harsh predatory glare and in the skilled movement of her body. He knew without a doubt, that if she really wanted too, Anna could have killed him by now.
Ducking and dodging her hard blows Sam felt his back hit the wall, and the flurry of movement suddenly stopped. The knife was dug deeply under his chin, and she was leaning up high; blank silver eyes boring into his. Suddenly she stepped away, the knife clattering to the floor uselessly as she wandered aimlessly away. As though nothing had happened. He was so stunned that he stayed still long enough for the orderlies to tackle him to the ground.
Suddenly, Sam remembered what he was supposed to be doing and started to struggle for the knife again. But when he glanced up at Dr. Fuller, he realized something. His skin was completely normal, the cut wasn't burning at all. Dean was wrong. Dr. Fuller wasn't the wraith.
Sam went limp as he realized what he'd nearly done. What he'd been willing to do.