In my group, our fighter fell into one of the pits and we were searching for the release lever. We found it, reset it, and by the time we'd gotten back it had been locked again. We didn't want to separate because we were squishies and expected to get snatched (like they tried to do to our sorcerer at the very beginning of the incursion). After two or three runs back and forth to the switch, my beguiler decides to get clever and surreptitiously cast an illusion of my pulling the lever, breaking the lever off and dropping the handle on the ground. I got kudos for being clever, but the Dark Stalker was watching the whole thing invisibly from the corner of the room.