Take a close look at this. Based on some of the other posts in the thread, this technique is being used at other venues. It appears to be some sort of groupthink crowd control method. There’s nothing like controlling a mob of zombies.
On a different but related topic, I’d love to know more about the guy in the red shirt controlling the mic.
Yep, there is some already-mature cult presence at that venue. I’ll keep my eyes open for it elsewhere.