Just to be clear, for those who haven't been aircrew at an airshow, please have a look:
Airshow Performances: Background: there is a Pilot's Briefing on each of the days. If you don't attend, and sign in, you don't fly (unless you're in a Team and a rep is there). On the table is a copy of the SFOC -- the Special Flight Operations Certificate. It lists all the performers, the limits they are authorized by the FAA/TC to fly to (100 AGL, 200 AGL, etc), plus the airspace boundaries and restrictions. It's a federal approval for the airshow to take place. There are always restrictions, and they're written right there. As a pilot you are required to read it, and sign that you read it.
The Air Boss then elaborates on all this during the Briefing, explaining how the maneuvering will take place, as well as the "box" layout and markings, comms, weather, alternates and so on -- the nitty-gritty of timings and takeoffs, and routing, and how the airshow will flow to satisfy the sponsoring body and the FAA/TC, while staying safe -- and maybe even achieving the goals of the sponsoring body and the paying crowd although that's always last priority. It usually takes an hour or more. A large show will break it up into several portions.
It's all quite formal. Not written in stone -- the briefing always exposes conflicts and questions which the Air Boss handles then-and-there -- but the pilot walks away knowing when, where and how they're supposed to fly.
None of the current youtube commenters were at the briefing for this show, or flew there, or stood on the Air Boss stand. These commenters do NOT offer analysis. Only speculation. They were not on site with a role in the airshow, and are not informed. (And yes, full-disclosure, I'm a youtuber too, although I never offer opinions on crashes ahead of the NTSB.)
Answering a specific question about vertical airspace restrictions, yes, it's a big deal. I walked into an Airshow Briefing recently with a show-routine in the Spitfire practiced and ready to go, only to find that the SFOC required the performers to be 1000 AGL at the east end of the airport fence (some home-owners refused to go to the beach that day...). THAT was a bit surprising. I had to modify my show right then and there, confer with the Air Boss, walk-it-out on the ground again and again and again, get it thoroughly settled in my brain, before I hit the starter on the Merlin.
It's here if anyone wants to see it.
https://youtu.be/yOthZs2koJw[youtube]https://youtu.be/yOthZs2koJw[/youtube]