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Yup. I'm holding off on more elaborate shenanigans until I've finished the megaproject. Which could be awhile, given that I'm (trying to) limit my dwarf count.
You mean the three tiles that flip back and forth between the cage and demon symbols? Those are captured demons -- Drunken_Gun scrolls over two of them around 5:38, and the third at 5:52. My guess is that those three tiles have empty cage traps underneath instead of loaded ones.
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::shrug:: I guess I didn't need this space after all!