She got what she deserved. Hit a cop, get hit back. Looks like that bitch needs to hit the gym if she wants to step into the ring with a trained police officer.
I did this job for fifteen years. I'm still a commissioned deputy although I no longer do enforcement. When an officer is assaulted in any way there is no requirement (that I have ever been aware of, and I work with well over 125 departments now) that they must issue any verbal warning before they take action to defend themselves and stop the threat. None. Verbal commands are a step on the force continuum, not an mandatory part of the SOP. You use them when you are confident that you don't need to escalate immediately to protect yourself or a third party. Otherwise you get straight to business of stopping the threat physically.
Citizens have an obligation NOT to interfere with police officers who are executing their duties. They have an obligation NOT to assault them illegally...EVER. When your brain turns to a bowl of **** and you go retarded and decide that it's okay to assault an officer illegally then you get to learn something about how life and the law work. If you keep your teeth or don't end up leaking from several holes in your stupidity wracked body you can consider yourself lucky.
A cop's objective is to neutralize a threat as quickly and efficiently as possible. There were three women all over this guy. When anyone lays their hands on a police officer, they have to understand they may not like what happens next. Instead of Cop Punches Girl in Face, the video could have been titled, "Officer fatally stabbed by teen." Sorry, but she deserve exactly what she got.
Thank you, Quazi!