Yup, without dropping a spoiler, a thing appeared, but I couldn't figure out how to interact with it. I spent a few minutes throwing every verb I could think of into the prompt.
I pushed up an update yesterday that adds a line to the room's description about that thing when it appears. Hopefully that'll make it clearer for people.
I finished it, I swear I used that phrase before, but it definitely worked this time. Great game! Although I like the Bard's Tales better than the Demon's Forge. If only you had a Dungeon Crawler asset.