It is wrong to hit people in the head
Dan was getting bullied in school by a senior because of something his sister did.
Dan wants to hit the bully to teach them a lesson.
Dan doesn't want to hurt the bully too much, so he hits the bully in the stomach.
Dan hits the bully on the side of their head, and they end up going unconscious.
The bully feels temporary pain, and he learns his lesson to leave Dan alone.
Dan risks being charged with legal action, and the bully could have possible brain damage.