Ok, hol' up! How did they get out of the loop they were in before??! That was a space time paradox. Lol. There is no origin and no end. An endless loop.
There's something horrifying about the setting to me. The Idea of actually being stuck in an unending staircase freaks me out. Also having to climb around the outside of the building. Idk, it's just very offputting. Well done, author.