What about denying the stairs during the fight?
its deplete btw
If you can't do this mechanic without a cheese strat, high level keys are not for you.
People can't even get past the first boss this week anyway, between the barely readable water bursting every few seconds, storming, the 360 beam and the water aoe to drop that can be on the same person multiple times in a row it's an absolute wipe fast when every single one of these mechanics will basically one shot you except storming that will throw you into them instead.
Worst hotfix ever. It was fine the way it was, revert this ASAP.