The folks in the cage were so afraid that the big bad bikers were gonna kick their asses that they couldn't get out of there fast enough. The should have helped and offered their mode of transportation if needed.
I think the bikers in the video were the "look at me, I'm wearing more Harley items than you," weekend crowd, not the killer Hell's Angel types.

The kids should have stopped, but I can understand why they didn't. Hopefully, another car was close behind to offer help.