Even though we wanted revenge on Diego for hurting Theodore, we couldn't just beat him up. That would make us no better than us. And stop calling us spineless or weak-willed or stupid. This is being mature. Once some of you readers grow up and realize that violence is not the solution to everything, and that you have to be a responsible adult in society, you will understand that you do not go around attacking people for revenge over hurting your friends or you.
If you really want justice (which is very different from revenge), contact the authorities. Which was what we did, so Diego got punished. I didn't know the details of his punishment, but needless to say he never provoked Jing Tian Academy or any of the other schools during the rest of the exchange session again.