I’m guessing it was security of some sort. The singer at the time said there was lots of security near the stage to keep people away due to the pyrotechnics set-up in the area.
It is crazy, but if they were grabbed for making those statements - one would think in today’s world that would be enough to get real cops over and hold them/ question them. At a concert I would think just telling people that “All of you are going to die today” (or whatever it was) would be enough of a terroristic threat.
But like I’ve said before - it is so unreal, so it becomes the ramblings of a nut-case. I forget the term - but it is dangerous to not view these unreal events as a possibility. Another Freeper talked about it quite a bit years ago. But we live and act our lives based on what it has been like. Never thinking that in an instant - it can go REAL BAD like this. (Or widespread civil unrest, long term power outages, etc.)
Normalcy Bias?
Widespread civil unrest isn’t really plausible in the US at current unemployment rates and demographics. You need more young men (aged 16-25) and in particular more unemployed young men in order to have any kind of widespread or sustained civil unrest.