Hi Sarah:
Maintaining discipline, or let's say managing class control is one of those activities that has to be acted on by teachers periodically. I've told students, "I don't like to be a policeman, but I know how". And sometimes that's the case, even to the point of stopping class and escorting a student out of the room. Occasions such as this are rare and often do not end up positively for the student.
Regards, Barry
