This is not a one-shot mechanic. I feel like I'm taking crazy pills reading this thread.

A one-shot mechanic will kill you (everyone) in one hit. Not only have I never seen everyone die to this at once, I also got smacked with one of the effects (as a DD not a tank) but not both and easily got healed up by other people and didn't die. That is, at the very least, a mechanic that requires two "shots" to do you in.

One-shot mechanics in other fights are like failing Landslides on Titan - you mess up the mechanic and you fall off the arena, knocking you out in one hit, one failure on your part.