I saw this happen at Disney World last year. My mom and I go annually, just something we do together to get away from all the stress. And we'd never seen anything quite like it. A woman who must have been in her early 70s just dropped in the middle of one of the parks. She was standing taking pictures of the castle, or just looking at it or something. Totally normal. It wasn't THAT hot either, even for Florida. At this point in time masks were still required...maybe that was a factor. I guess she ended uo being ok, but she literally fell directly onto her face for no discernable reason, then got up shortly after and went about her day. She seemed stunned, like she had no clue what happened or why she fell. Her family just kinda stood and watched in shock. She was older but not like sickly or frail...and she dropped, like directly face down onto the ground as if her body just gave out. Not a trip, or a stumble...nothing like that.

Anyways...I dunno. I'm sure a lot of things could have caused her to fall, but in that moment I was thinking the same thing you probably were at Universal: That it's not right, and that maybe it's something to do with the vax and the heat. Clearly there's a connection there...