School probs?

there is this person in my school(xyz lets call it) starting **** with everyone including my friend and one of my friends live by him and my friend went to xyz's house to ask him what's his problem but this person's uncle said he doesnt feel like coming out so the next day we were walking to the line during snack and xyz said to my friend all this "WHAT THE **** IS YOUR DAD GOING TO MY HOUSE FOR SAYING GOTTA STOP AND ****" i dont really remember the whoe convo but then i remember my friends like "i just wanted to ask you why do you hate me dude" and xyz said **** OFF I DON'T WANT ANYTHING TO DO WITH YOU ILL **** YOU AND YOUR DAD UP. immediately we reported that he sent a threat to my friend and the cop had to come and ask q's blah blah blah and they called him in when we left and prolly sent him a warning... what's bad is my friend and xyz are neighbors.. on the other hand, xyz doesnt even talk to me or even look at me. what should i do if xyz trys to get at me, i have history w. him!