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Maybe it was that level, but if so, the stairs didn’t spawn after I killed it.  There was only one enemy on the level, and I *think* it was black, not red, and I don’t recall seeing any flames, although it spawned right next to me so it wouldn’t have been able to leave a trail.  I killed it immediately, and there were no stairs afterwards.  Spent quite a while just wandering around the empty level, standing on every tile, bumping against the walls, wondering if there was a secret thing needed to advance.  Pretty sure it was a bug, since an error message was emitted to the console.