I'd like you to all to comment on any real life fights you've been in.
I've only hit people twice with the intention of actually hurting them. The first time was in the third grade. I got ear infections a lot, and my mom made me wear these wool hats to keep the wind off my head. My best friend Jake would always grab my hat off my head and run around with it, making me chase him. I told the teachers but they never did anything to stop him. I told my dad, and he told me that the next time Jake took my hat I should punch him in the stomach and take it back.
So I did. The teachers were mad and they called my dad. They said, "Michael punched Jake. That's bad." My dad said, "Yeah, I told him to, since you weren't doing your job." That was the last I heard of the issue.
The second time was in the fifth grade. I asked to be excused from class to go to the bathroom, and a minute or so after I got there the class bully followed me inside. We were alone, and he started pushing me into the wall and making fun of me. Using the tactic my dad had taught me two years earlier, I punched him in the solar plexus under his ribs and he collapsed onto the ground. I went back to class.
The bully came back into the room about 15 minutes later and didn't say anything to anyone, as far as I know. He never bothered me again.
I don't know if these really qualify as "fights", but that's all I've got.