Firstly you mustn't fight,you only use the power to defend yourself after you have tried every other solution.
Secondly, You mustn't be so violent in these situations, you don't want to find yourself in a very serious situation which you will regret.
So when you use power use it wisely, for example never hit the face, as hitting the face can cause your opponent a serious injury like a broken jaw and it doesn't deserve that, you are just in a school and he won't kill you, he won't even cause you a serious injury, so you can use a simple good combo which will show him that you are more powerful and stronger than him, you can launch three or four quick punches to the rips and the stomach (not so powerfully) then throw him to the floor on his back and that may cause him much pain if it is done in the right way on a hard floor.
You can visit the article in the source book, it will give you a good description for the combo.
Leg kick I would say. Throw the leg kick if you hit him hard and in the right place he will be distracted then you throw the cross right to the nose. From there if he drops his hands keep throwing punches. If he comes back swinging take some big steps back and then when he throws a punch go under if and then go for a double leg takedown from there ground and pound.
aim for the jaw throw a really fast hook left or right it doesn't matter then wait half a second if he is not going down throw another one he will go down for sure..if he doesn't he wont be able to fight cause of the dizziness luckily if you do it one time then you wont have to fight again..the kids in school wont want to fight you
kick in the balls punch in the face with boxin stance and stay like that, dont get caught in the grabbing and pushing stuff its boring and in the end he will think it was even and want another one so if u do end up grabbing an that poke him in the eyes try get the nose or pull by the ear until you are able to stand and punch again ready to go agen
You shouldn't be fighting, but if it's self-defense hit them in the nose, the smart ones will back down, the dumb ones will have there vision blurred from their eyes watering
Hands on the throat, squeaze and with the other hand, punch ;)
right hook should knock his head off
