Phooey - I can't get it to play ;'(
Well, if it won't play on your device, here's the lowdown:
Black dude walking along behind White girl in a shopping mall, accelerates his pace to overtake her, you see him winding up to swing at her from behind, camera loses him for a moment and recaptures the action with both of them falling to the ground with her on top, raining blows down on the back of his head.
From the left, outside the frame, a man comes sprinting in, kicking the Black dude's face like a field goal, yelling, "You hit girl? You hit a f**king girl?" He gives a couple obligatory hammer-fists to the back of the head, but the dude doesn't move, he's just turtled up trying to cover. Then the girl starts raining heavy hammer-fists and gets about 7 or 8 in before the guy pulls her off, just as the security guard arrives.
Bystanders explain to him, "He hit her" and she walks away.
The video quality is poor enough that you can't see blood or details of the assailant's face, but you can hear people exclaiming at the blood pouring from his face.