Minor injuries have violated the criminal law. Criminal investigation is a very meticulous work, and it is necessary to basically confirm everyone's role in the case before closing the case. Since there are still people who have not arrived at the case, it may be that the person who has not arrived at the case is the real murderer who injured the other party. Especially in this case, the case can't be closed for the time being, and things have to drag on for a while.
If you commit a crime, you have to bear the consequences. Now he is meat on the chopping block. If no acquaintances know the inside story and have no chance to get in touch with the injured or their families to understand the situation, they have to do what they should do and wait for the result.