Beat the guy to death with a bat... you'll be doing him a favor by putting the thick headed azzhole out of his misery...
People who fight in school'n'such and threaten people like that, IMO, are just morons who don't know any other way to deal with things...
"I weel pounj00 into ze grownd becuz eye am beeg an toof! Graaarrr! Fear mee!"
But... that's just me.... *runs away*