[Part of him wants to ask if she has some opposition to just calling him Luke, but maybe that's not the point. Instead, there's a little grin.]

Are you trying to scare me, or are you trying to call me stupid? Only one of those is gonna work. [That being said, he's rubbing at his eyes for a moment.] Look. If I was really interested in killing people around here I'd be doing a lot more to throw people off my track. As it stands, I'm getting real tired of watching kids get picked off. Interrogate somebody else who might be able to get you answers to help all of us, okay?