C'mon man you saying you could beat anyone here under 18? I'm 17.. But even after hearing your story I wouldn't say I could beat you because I don't know what you look like or anything.

IMO the only way you gonna get that crackhead off your back is by doing something about it.. You say he cracked someones head open? Not by his fists obviously but maybe slamming the head into the wall did it? In that case anyone can do that I could do that, but I wouldn't because I would feel like shit afterwards.