Be me, on an alt trying to get sch to 90. Queued up for leveling roulette, insta-pop but it's 4 min in. What could be that bad that the healer left?

I load in and it's the 83, they're at the first boss. PLD was vainly trying to solo it since the other two dps (dnc and blm) had eaten vuln stacks and died.
Rest of party respawns, I get to the boss line and was afraid to ask what happened, but asked anyway. 'Healer had stack marker, I stacked with them, we both died and healer left.'

Hmmm...

We try the first boss and it became apparent that something serious was going on. DNC never really used Standard Step more than once, nor any of their other stuff like Tech Step at all; BLM was doing their best impression of 'I'm not moving'; PLD was trying but seems all 3 had issues realizing how magnets work. Somehow the DNC survives with 3 vuln stacks before dying. I scrape them off the floor and continue to Broil and use my cooldowns. There's only so much band-aid stuff I can do as a SCH.

One heal carry later, we get up to the second boss and the DNC still has not bothered with using a majority of their kit. I watch and suffer in silence as both dps eat vuln stacks, mainly the DNC, even after running and jumping over to the pads needed to step on to avoid death. DNC once again dies in this fight.

One more heal carry later, we're finally at the last stretch, PLD does his PLD thing and mass pulls...along with Clemency'ing themselves. PLD if you're reading this, my fairy and SCH kit would like to have a word with you later.

We finally get through the trash (PLD randomly HG'ed the last 2 packs), we finally get to the last boss...and the DNC gets the mapping achievement...strange how they were 'new' and did not bother to ask about mechanics. Mechanics they've died to at least once per boss fight.

And mechanics they ate. The dnc ate quite a few easily dodgeable ones, and died to the chasing claws and nearly got the blm killed in the process for the dps check. We finally finish the last boss and it's been about 35m into the duty. DNC immediately bounces and the BLM was shaking his head. I'm fairly certain the PLD was doing more dps than the DNC based on buffs alone, and I have no idea if the BLM was doing good damage or not the whole time I was there.

I need an aspirin.