Wish my housemates kid had "defense" problems. Got called to take her to school cause her son had hit a classmate. Got In school suspension. Here's the scenario.
The Boy is at a group table in class working. Goes to his desk to get a pencil, classmate A is sitting at his desk helping another classmate. So boy hits classmate A. Classmate B and C tell the teacher.
Boy first tells Vice Prin he "slipped and hit him accidently", next he says classmate A kicked him in the privates. Oh yeah, that was 2 weeks ago it turns out.
Me I'm of a mind to fight only when absolutely neccessary (sp), sounds like yours was forced into it and was in the right. Housemates seems to have anger managment issues already.