You guys are being stupid.
Ya...attack him one on one or in a gang. Real smart. Get the police called. Kill or badly injure someone. Piss them off more so someone comes after you. That's always the best way to handle it...
Come on guys! Just call the damn cops. It was an assault. If he comes after you again, he does not pass GO, he does not collect $200. His ass goes straight to the slammer, and you get awarded with a nice lil piece of paper called a restraining order, so if he comes anywhere within 500 yards of you, he goes straight back to whence he came.