I've gone off trail to avoid accidents more than once...... the best part of the video .. The guy and his buddy turn around to make sure everyone is okay..... that is what I get out of it..... yes some folks messed up.... but good riders always turn around to make sure everyone is okay.....
I would submit that you have a responsibility as a human in our society to do the above. I would also submit that it most certainly does NOT have anything to do with being a "good" rider or any ability level of rider for that matter.
Furthermore I fail to see how anyone would not HAVE to turn around considering these riders were all in the same group. Explain to me the "out" of possibilities on that one.
To expound yet even further, If I have ever read a post submitted solely for the sake of enhancing one's post count yours has to be it.