Why did he step behind the curtain so fast? It was unexpected, judging from the SS detail who were expecting him to go shake hands and then hurriedly went back there with him.
Before the rally there was a security guy standing on either side of the podium for awhile.
I think there might have been threats made.
Doesn’t matter....we are not privy to the dynamics there....they do what they do with purpose....we know this much...that there was a growing crowd of anti-Trump people building up outside during his speech...sufficient reason to usher him away IMO.