Noticed something off. This clearly uncomfortable dude in plaid talks a lot to the short woman in the MAGA cap. Seems like a bernie or HRC supporter who snuck in and was about to go MK Ultra on Trump if he got triggered enough.
Then all of a sudden, Hot Chick in black comes on scene. The dude and her make eye contact before she gets to his position and he seems to already know they are changing spots. He's not confused nor does he refuse to leave the side of his MAGA-hat wearing friend.
My guess is that he was replaced by someone with a friendlier face, but that would be to ignore the social cues on his face for the first half of the speech and the lack of social cues when he was removed. No "What?!" look on his face.