A kicking sounds reasonable to me, what did your mate do?
Stand and watch or get some loo roll to mop up his mess?
However, knowing and being an orange belt in jujitsu - i know he would have come off worse, though not all people are as well trained in self defence or as confident. But when all you can pull is a few bones covered with skin - i am gonna use it to defend myself/family/oppo as I see fit. I dont care who they are or how big they are!