fucking shifters

Sam grunted as his copy shoved him back, stumbling into the brick of the fireplace. Before he could spring back, the shifter was on him, body pressed up against him, pinning him to the wall. He didn’t waste a second in reaching up and cupping Sam’s head in his hand.Sam realized, distantly, what was going to happen as it happened. The shifter yanked his head forward, and Sam barely had a moment to think ‘Oh, shit’, before his head was being slammed into the brick.Fiery hot pain bloomed on the back of his head, and he let out a cry of pain, hands scrabbling uselessly at the shifter's wrist, trying to pull him off.“Sam!” Dean cried from the other room where he’d pinned down his doppelganger and had a knife to his neck. He dug it into the thing’s throat and practically flew towards Sam, but it was too late.-Or, Sam gets a nasty concussion on a hunt. Dean's taken care of a concussed Sam more times than he can count, but that never makes it any easier.