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here...
Another angle (with sound--captured by the hero who whipped out his cameraphone instead of intervening) HERE.
If in fact it was real it's natural for us to wonder why nobody did anything to him any sooner, but unless a person has had training or plenty of experience in totally unexpected and "fight or flight" moments, odds are that most people in a group setting wouldn't quite know how to react in the heat of the moment, or else they just plain wouldn't.