does everyone just basically watch as this asshat throws stuff at you?
if so, tell other students so the audience doesn't get on the asshat's side. you can't do stuff if you just throw stuff back at him, he won't stop.
if other people stop just watching and ACT then he's dead for sure.
if not, get him to start physically bullying you. he'll punch you, and you'll have the bruises to prove it.
also ENOUGH WITH THE NUCLEAR brown town! JESUS CHRIST IN HEAVEN, WE'RE TRYING TO STOP AN ASSHAT HERE, NOT PLEASURE HIM!