Beating up the bully requires one to be capable of such when the bully may be larger and physically imposing and part of a group then not getting treated as the guilty party afterward

I was small for my age up until 10th grade. Bullies would look at how small I was and decide I was an easy target, so they would start in on me. One thing you have to realize is that bullies aren't bullies because they are tough and good at fighting, they pick on the smallest, 'weakest' kids they can find- so being a great fighter isn't nearly as important as being willing to fight back in the first place. The point isn't to beat them up, it's to make them think twice about picking on you. If there is a chance they will get hurt, even if they end up winning the fight, they will always just move on to the next victim who wont fight back.

Between 5th grade and 10th grade I got into 1 fight every year. A kid who didn't know me would try to bully me, and I would defend myself. I never lost a fight, not because I was a badass or anything, but the teachers would break up the fights before it progressed too far. I would always get in trouble with the school, but never with my parents who taught me it was ok to defend myself (but not start fights). When word got around that about the fight, I wouldn't get picked on the rest of the school year. When the next year rolled around it was either a new student, or I was the new student. Someone who didn't know me basically who would try to bully me.

You just have to ask yourself- would you rather accept the bullying and allow it to continue, or risk getting beat up by fighting back and getting in trouble- but putting a stop to it.