"So, what should you do if you see a fight?— If it is at school, you can run and tell a teacher. And if it is away from school, you can call one of your parents or a policeman. Yes, even when other people want to fight, we should be peaceable".
"True disciples of Jesus do all they can to avoid getting into fights."
The overall tone of WT rules is very pacifist on this subject. Run and tell a teacher or policeman. Wait! Aren't all the police and the military part of the government and controlled by Satan? Why should we call upon agents of Satan to deliver us from evil?
These were the kinds of questions that troubled me as a pre-teen. It made no sense. In fact, I found that (in spite of WT pacifist rearing) standing up to bullies is the best way to ensure that they leave you alone.
But, God forbid that you defend yourself and give the bully something to think about. No, don't do that. He might get mad.
"But what if you let yourself get into a fight and you win? What could happen then?— The one you beat up could come back with some friends. They might even hurt you with a big stick or a knife."
More fear.