hmm, alot of bad ideas that could really cause you problems or get your ass kicked, maybe (how big a boy are you?).
You said you were marking the line. Maybe he doesn't know where the line is ?? I'd try talkin. I'd want you to come to me if I was that guy. Screw with my stuff and you may have a war on your hands that you don't want. You're property or not, talkin could be alot cheaper and less painful.