I've tried testing it in several areas today, couldn't seem to actually make any skips with it. They seem to have their invisible walls go all the way to the sky, and I haven't found anywhere to OoB yet

And those are called ghost rounds, honestly probably the best sigil in the game considering how strong the crossbow is. With quick swapping you can easily get quick times without worrying about reloads

Tested it for a little bit, its incredibly easy to do. You only have to dash into the wall at a certain point to trigger it, don't have to kill any enemies at all. Seems to have a huge hitbox too and I got it 5 times in a row without fail

Idk if I can test this since I have to go to work and I wasn't recording, but I think I found a skip

I was playing voke and I was on the last enemy room before the boss, accidentally fell into the pit and it spawned me into the boss room with the room half loaded and the cutscene playing. I had killed the first 2 waves of enemies before i fell in. Was able to finish the boss and level normally though it never fully loaded

Unfortunately dont have time to test anymore today