They damn well should have been arrested. He told her LAWFULLY multiple times to leave the scene and she didn’t, instead sticking around and inflaming the situation.
So, if a cop responds to a mob scene, in your world, is it permissible to ignore the LAWFUL instructions of a police officer to disperse? Because that is sure what it sounds like to me.
Some here do not understand that when an officer asks you to leave he is not asking you for your opinion.
In most cases, when a police officer tackles a suspect, the person being tackled in arrested.
Without an arrest, it is difficult to explain why an officer would tackle a person who was not breaking a law.