From what I understand from Maria (the victim) she was trying to stop the person picking up the phone. As it turned out, she got her phone back in the end, minus the memory card.
The frame by frame analysis that Gallus Meg does, indicates to me that it is a tried and trusted method of robbery, (rather than attack). She identifies three men, working in unison.
They didn't realise her camera was strapped to her wrist, which put a spanner in the works.
That and the fact that, despite being 60, she is a fit and hardened feminist and her primary reaction was fury, rather than fear.
She defended herself from robbery, tried to prevent the attacker taking her phone, but she is accused of starting it.
Women everywhere, allow yourself to be robbed in broad daylight amongst people, otherwise you will be held responsible for getting punched in the face.