[quote=@13org]
The throwing star hit him on his groin, making him fall on the ground, but not before letting out a very dangerous looking heat wave in the direction of the panda boy, the big guy and a brown haired girl that was nearby them.
She didn't knew if was because of how dangerous that heat wave looked, or because she had an particular interest on two of the three students that were nearby, but she had to do something.
[/quote]

Your character takes a look at and understands Brock's powers going by your own post, so that's not an issue. Meilin can step in because she saw him fire some form of heat wave and wants to stop him from doing something potentially dangerous with his powers. There's also Akiko trying to start a fight with Brock who, by the rules of the game, is eliminated and should be left alone as he steps outside and goes back to his end of the field. Brock, meanwhile, is in fact trying to fight back against this teenage girl with his dangerous powers that Meilin already saw. You've got three perfectly valid reasons for a teacher to intervene here, m8.