They're finally all dead after 8 days of tossing around. There's robes, teeth, ears, shields, arrows, and possibly more vomit than there is blood.
This poor guy got his head exploded by a cotton cloak:
When we embarked my dwarves named this fort "Roombeast." I couldn't have forseen that the Roombeast would be a room-sized drawbridge that chewed on elves like stale beef jerky.
Also, FWIW, I gave the room a couple more smashes after the elves were dead and none of the bodies or gear got atomized. So the guy above is probably right that it turned out being a retracting bridge instead of a raised one.
When initially deciding that I was gonna atomize all of my "distinguished" guests, I had designed, cancelled, and redesigned the bridge a few times before finally letting it be constructed. I must have forgotten to specify the raise direction the final time I designed it, and caused it to be a default retracting bridge.
I'm OK with that, though.. I think it made a better story for my engravers to carve onto items in the future..
It's also pretty funny to imagine a room full of elves constantly having the floor yanked out from underneath them like a bad magician pulling on a tablecloth and yanking all the dishes off the table with it!