Fortunately I didn't have to sit there wondering what was going on! I eventually looked on the
Gamebanshee guide wondering why my attempts to hunt down the bosses didn't seem to be going anywhere and realised my error.
Although I have a save right outside the dungeon, I don't fancy killing all eleventy billion gargoyles again so I'll attempt to chuck my pyramids back over the spikes: or rather
through them as I also discovered I can do.
It's a pity I'm approaching the end: I never realised DD was so much fun. Y'know, in spite of everybody else saying it is! I'll resume Beyond Divinity next, although I think just mostly not being set on Rivellon (at least AIUI) makes it a bit harder to tune into.