There's no denying a broken nose and some lost teeth will make many bullies twice about trying again. Problem is it's often illegal or against the rules to do

There's no denying a broken nose and some lost teeth will make many bullies twice about trying again. Problem is it's often illegal or against the rules to do it since deliberately beating the crap out of a bully isn't self defence in the traditional sense. And in the cases where it doesn't work, the situation may escalate or the victim might end up being punished harder than the bully.