She watches him, silent, for a second, and it may seem like her resolve is wavering. Unfortunately for Mitchell (or not really, considering what's likely to happen to him and his volatile conscience if she does let him out of the room), she simply shrugs one shoulder and turns away from the door.

"Pain is good for you, Mitchell. It's how you know you're still alive." She glances back over her shoulder, expression inscrutable. "Anyway, you'll live."

But she doesn't want to stand there watching him threaten and plead, so she won't.