Serious rule violation, with sweet consequences

Alternatively university:
Magic Au!

It was a normal argument between Fu Yao and Nan Feng. However, Fu Yao lost control and wanted to wipe out Nan Feng, which is why he used magic, although every student was forbidden to use magic against someone if it was not self-defense, even outside of boarding school and classes one was only allowed to use his magic within limits. Fu Yao exceeded that limit, and Nan Feng had to pay the price.