That's a pretty disturbing video.
The guy basically throws a Huge Monitor into the tiny lady to his left. Right then it was time to subdue the guy it never should have been allowed to go any further than that.
There are approximately 10 men in the room and not one of them does a damn thing about it. I don't know if you can just attribute the lack of response to the outburst happening in a workplace environment.
I'd personally feel threated if a guy starting going nuts like that in a room I was in. I'm sure I'd end up losing my job but in a situation like I'd jump on top of the guy and beat the living piss out of him until the police arrived. What I hope I wouldn't do is just stand there and watch. Personally I don't think that's the right thing to do, more people could end up getting hurt.
"The world is a dangerous place, not because of those who do evil, but because of those who look on and do nothing." Albert Einstein
On the other hand maybe those people just watching are hoping and praying they get to take the rest of the day off with pay.