Suppose the goblins are in a room and there's a trap that just triggered which fairly rapidly flips the room upside down. We're talking about a trap that wasn't foreshadowed here, so best practice is to tell the players that the room is flipping and look to them to see what they do next.
Let's say one of the players says something like "we run and jump on the wall as it rotates and get up as fast as we can and run and jump on the next wall which is I guess the ceiling as it's about to become the floor!"
Is this how you'd adjudicate?
Definitely a roll. Next in marching order rolls, or cedes their position, or gives their die to someone who's already gone.
Action: everyone does the running stuff
Danger: stuff falls out of packs/hands and goes flying and gets broken
Harm: yes; everyone gets exhausted
If Action is failed, then everyone gets injured (is this way too harsh?). If Action is progress, then... one wall? Seems lame, they'll just try again, but maybe that's intended. Danger would be less and maybe no harm and maybe action failure after the second is just exhaustion.