That CO guy is very smooth, especially shooting on the move!
Here's an IDPA stage design of mine back from 2016 when evil clowns were the rage on the street. I designed it with shooter's option of going right or left first after retreating in the hallway from the start position. All cardboard threat targets except for the dropout and clamshell activators were covered with clown masks and T-shirts so shooters couldn't see the scoring zones. Everyone pretty much has to call their shots on those. A hidden drop-out target appears in the previously "cleared" hallway activated by a pepper popper behind the far threat on the left shooting position. Most shooters don't really give a second thought the possibility of more threat targets needing engagement in an area they have already "cleared". Any reload points had to be strategized accordingly depending on if you were shooting an 8+1 or 10+1 division so as to avoid running empty in the middle of the clamshell disappearing targets. I was shooting CDP .45 in this one.
That's a really fun stage. I like that you threw in there options on how to run it.
The only IDPA club I go to any more doesn't have much creativity in stage design and really dumbs things down. They're not alone, there's some uspsa clubs around that do boring stages as well.