Also, there would be no guarantee that the guest's face would be at the correct angle and would fill the entire frame of the mirror. And the scareactor and the guest would have to keep their head perfectly level as well to make that work. Would probably end up looking more like the figure from the end of Meshes of the Afternoon, which granted would definitely still be plenty creepy.
Another idea could maybe be having a fake Universal employee get attacked by a tethered version of themselves?
Well now I know what Meshes of the Afternoon is, that was a fun trip.
Blackout Tethereds would be a fun idea. Maybe also the thing they do at Orlando where someone in the line gets attacked.
Wrt the mirror, it's not a perfect system, but I was thinking more in terms of "give a split second to where they see their necks sort of align with the jumpsuit" and then they jump out of the mirror and scare them as just a jump suit with a black hood for a head, instead of trying to find a way to make it the doppelganger while the actor is in motion. If the actor is holding still, people might think they're a mannequin and actually try to align their necks with the hole themselves, before they jump out at them. Again, as long as it's too fast to scrutinize and the actor is average height, people won't sweat it too much and they should be able to get a good scare in.
It's just a new twist on the "pretend you're a mannequin and freak people out" thing that HHN has been doing for a while. Since people have probably gone to Haunted Mansion at DL, most will probably think it's just a fun photo-op with the dummy to make it look like you have a doppelganger, not an actual person.
I'm actually not convinced that we need to see tethered versions of ourselves in this maze in order for it to be successful. It's isn't often that an HHN maze is designed to like, "put you in the movie." Sometimes that happens, but more often than not, the audience doesn't take on the perspective of someone in the story, we're just experiencing the stories in a more four-dimensional way.
The team just needs to focus on re-creating the atmosphere and bringing those amazing set pieces to life, not devise a way create individual doppelgängers for everyone who goes through the maze.
Yeah, but it's still fun to think about.