"She's not my girl. Just don't go screwing around with Jo; she'll kill you where you stand." Dean shrugged. "That's if you need to be killed; she likes to shoot first, ask questions later."
He wasn't warning because he thought something funny was going on. He warned the kid because he kind of liked the him. He didn't want people he kind of liked dying on him because they were stupid.
"She's just a friend that I look after from time to time." He shrugged about it. "Don't like what the City's done to her place. Fuckin' bloodsuckers."