Man seriously, there would have been NOTHING wrong with beating the living shit out of him! This is coming from me, a totally peaceful buddhist and pacafist. But if he's going to go that psycho, I mean that's criminally psycho, he's got to learn the reality of what's going to happen and a thorough beating would be a justified and important lesson.

Beside that situation though, I'd go so far as to say he needs to be on Lorazepam or something strongly sedative and/or euphoric. I'd even say insitutionalization might be necessary.