I don't know if the bathroom you mentioned is a dormitory or a public one. If it is a dormitory, you can ask the other person to wait and tell him to come out quickly. If it's a male, don't worry about it. After all, it's not that I like to stay in the toilet, and it's not a good place. I hate it when someone knocks at the door when I go to the bathroom. Usually I don't care about this situation. I didn't mean not to come out.