He doesn't move away from the doorway, but keeps bracing himself against it, as though he's hoping he can push through any minute. The momentary lack of focus on killing everyone in the neighbourhood means that his features return to normal.

Which he's intent on using to his advantage. "Please. I can't --it hurts." It doesn't. But he is a cruel and manipulative thing and, even in the haze of his mind, he is intent on doing anything he can to get out of this room.