Oh god, did she really have to make that offer? Mitchell through her a side glance. He wasn't good with drinking human blood. From humans. Laura he couldn't kill. But humans? "I think I'll be fine, thanks," he said. "So, err... where are you from?" Change of topic, something that wouldn't make him think about her blood and how it would make him feel.
(Ooc: Yeah, by now he would have taken her up on the offer. ;-) He is oh-so consistent with what he says and a hopeless addict.)