I think I'm going to become a policeman now. They're clearly untouchable.
Lady in the grey was getting pushed against the wall even though she wasn't resisting or fighting back. All she was saying was that she wasn't doing anything.
Lady in the black tank top tried to push the cop away because the cop was pushing the lady in the grey.
You can clearly see the cop pulling on the lady's hair. Thats when the blank tank top lady starts to push the cop away. Heres a gif of the cop pulling on her hair
Cop smacks lady
She reacts how any reasonable person would react when they've been hit. She fights back.
Cop arrests lady.
If you saw your friend being pulled by her hair by a cop and didn't react...then WTF kind of friend are you?