Seems like it's gotta be one of two things: Either (1) Something is being done TO them, or (2) something is being done BY them.
Any chance in the world that these peeps could be plants, so as to try to make Trump look bad and/or simply disrupt his rallies? We know that "the other side" is desperate, and that time is running out for them . . . (Disclaimer: This is ONLY speculation on my part.)
I suppose that is possible. I was watching it live when it happened and had no idea what was going on but figured it out eventually.
-SB