Happy Clappy Duplicant needed to be rescued while digging. My Dups were finishing out an area when research completed. They did the lil happy clappy dance and dug out the tile directly below the Dup at the exact same time (yes I know the timing is super low odds to recreate). The moral of the story is that the happy clappy dance froze the dup mid air 1 tile from the ladder. Nikola was in Hydrogen gas and needed a red alert to be rescued. Saved him by building a basic tile.
Good Luck Timing finish research and dig a tile out from under a dup a the same time. (Froze in place didn't fall)