[Booker started from where he was seated, shooting his gaze around whiplash quick trying to spot just who had thrown that damn knife. He wasn't in a bad enough way to start seeing the battlefield every way he turned yet. So when he saw a young girl as the one responsible, he's slightly intrigued.]

They're called Vigors, girl. It's kinda like, uh...medicine.

[He doesn't know how the hell else to describe it.]

I don't really know that much about it myself, to tell you the truth.