Very sorry about the long delay; life is having fun with me...
Curious. I noted an alcove that I would assume is the elevator (and I thought was just a door) but not much else. I will need to go look around some more next chance I get.
Edit: And now I can declare that it's mostly just that I'm dumb. I never tried to put both of them in the alcove. But there's still a messed up trigger somewhere as my first attempt had me shuffling both around in the alcove until the knight pushed the witch through the wall to her death (pushed halfway, couldn't work her back out, pushed her all the way). Upon redoing the level, it worked fine. All the rest worked fine.
The narrator needs a nice long nap and to get back to work. This was a fun little game I'd love to see expanded!