Secondly, although my sister's starting point is correct, it is obviously problematic to beat people seriously and may face legal problems. After all, legally speaking, it is wrong to hit people. If it is serious, she will bear compensation and legal responsibility.
Therefore, we should be calm and seek reasonable and legal ways to solve the problem in the future. For example, if you ask the school to come forward, you should also pay attention to collecting evidence and take it out to punish those people through legal channels when necessary.