It's good to remove abusive people from an environment.
Emanuel is teaching a classroom of at risk teens and one particular student keeps starting physical altercations.
Emanuel wants to keep the class under control.
Emanuel removes the particular student from the classroom and tells him that he cannot come back until he is ready to settle down.
Emanuel clears out an area in the classroom and tells the one particular student and another to have it out hoping that they will settle down afterwards.
The rest of Emanuel's class is able to focus and learn with the abusive student removed.
The fight between the Emanuel's students starts more fights and the class gets worse.