Well the standing there bit....that is pretty consistent with what I have seen and experienced is situations like that. You mind first is processing what is happening, then the immediate concern is helping your friend, and by the time the "a$$ kicking" neurons start to fire it is too late to do so in a defensive way because the guy has stopped being a threat. So all you have left is revenge and that is a hard one to predict. Three days after the fact people really don't know why he did it so at the time it would have been even harder.
There is a great book called "Deep Survival" that talks a lot about what happens to the mind in emergency situations. It explains a lot of the reaction you see in that footage. I recall an interesting anecdote of an F-15 pilot involved in a mid air collision in Alaska. The plane is in the process of breaking up and the pilot has the presence of mind to clearly call out "Eject" three times before he does so. By doing this the air controllers were able to accurately pinpoint his position the moment he ejected from the plane. This in turn helped facilitate his rescue. So the book talks a lot about how flight training prepares these guys to keep a cool head even when their plane is disintegrating. Anyways I digress. The point is that it is safe to say that Wayne, his wife Fran, and BJ have never trained for an attack like that and thus they need to process what the edited is happening first before they do. Even the one being attacked, Wayne, hesitates for a second or two before getting away from the guy. That is to be expected.
So it is a super interesting book and worth the read if you are interested in understanding some of what you saw. Here is a link to it on amazon. http://www.amazon.com/Deep-Survival-Who ... gy_b_img_y
As for some of your other points, I agree that until we hear that guys side of the situation it is kind of hard to tell if he is maliciously trying to spread the fire or if, in a panic after realizing that whatever he was up to went horribly wrong, he is trying to put the flames out. That is for the courts to figure out. Wayne had mentioned that eventually the entire footage will be released as it was being filmed by the TV crews as well. Of course there is also a chance that the TV station will do what it can to suppress the footage they have for legal reasons. We will just have to wait and see on that?