She stares at him. She actually stares at him, gaping a little. "Why are you doing this on your own?" she asks, her tone quietly stunned. "You're acting like you think you're on borrowed time but you don't know for certain, and even if you are, we've got one of the top neurosurgeons in the world right down the hall, Stiles!"

Wow. She's actually really upset. Way more upset than even she might have expected.