Re: The original question in this thread:
Do you mean what would I (we) have done if we were the victim, or a bystander? If we were armed, or unarmed?
If I were the victim, armed, and knew what was about to go down there would likely be a gun drawn and/or more than one white shirt with a hole in it.
As a bystander though, you have to be really careful. Among other things, you don't know the whole story. Let me give two examples.
About a year or so ago I was at the EZ pass toll building and some fat slug in a caddy ran into some poor paki livery driver's car, screamed abuses at him, got out and assaulted him. I ran over there to help and the guy jetted. we got his plate and the cops did .....squat. Example of when TO get involved.
Another time, i see this guy chase down and try to assault this woman who is trying to run away, he's grabbing and trying to choke her. I cross two lans of traffic to try and get over there to kick his ass, but what i don't know is this broad had stolen the guy's wallet and he was just trying to get his property back. Example of when NOT to get involved.
I look at the video and assume it's an innocent victim, scumbag gangbanger initiation or something. But that's also just an assumption. I'm not sure I'd want to bet my future that the "victim" didn't have it coming or it wasn't just a case of payback or vigilante justice. If I had been armed, there might be a gun out. Whether I would start punching holes in white shirts would depend on if they came at me and were going to cause me "grievous physical injury" (from the rulebook).
Another possibility: What if the whole thing was staged to put on youtube and draw traffic and make ad revenue? (it's happened before). Boy, that would suck for you if you started shooting.
Not saying you shouldn't defend someone in trouble, but shoot first / ask questions later is not always the smartest or even correct move.