2nd time we ran the dungeon, friends of mine and I decided that we wanted to see what's going to happen, if you can't do the whole or just parts of the trial. So we just stood in the middle and didn't move, intentionally failing. But have I ever seen it fail in DF? Nope, sure there's some players that will fail all sequences of that "boss" fight, but mostly at least 1 person makes it through, therefore nobody needs to repeat it. I am still waiting tho, that everybody fails next time I get it as roulette, but I doubt that this is going to happen, because even people that didn't do coil back in the day, unless they turn their monitor off, will be able to beat these trials. Even the ones with the slowest reaction. It's just to simple.