I am a lawyer and I'm not sue happy. Looks like you will not have medical bills. The school punished him. Maybe not enough, but he was punished. The authorities (beyond the school) should be notified, but beyond that, if it were me, I would not pursue a lawsuit....or revenge. I would avoid this guy and move on. Maybe it's been to long since high school, but I would not let that guy's idiocy control my life or drive me to do something that may backfire.