Last night I queued up for roulette as healer, and rolled the Vault. I said my hellos and checked the group's gear (this is becoming a habit at this point for me); everyone's got decent gear thankfully...though the tank really needed to update their right side. Normal ironworks gear and that brand-new ring really don't belong in mid-HW content.
Party comp was WAR, NIN, SMN, and me on AST. We get a notice that someone was new to the dungeon. For the most part of the first hallway everything is going normally, then we get to the first boss. The second the smn asks about mechanics for the first boss the war pulls.
While I manage to keep the party alive (save for the smn nearly getting one-shot twice by the green marker and the nin eating a double bleed), I suddenly see our war tank sitting at 3k hp and start mashing cures and ED when I notice something else: he was stance-dancing at the worst possible times (you know the first boss' frontal cleave? He'd swap a couple seconds before that so suddenly his hp would get nuked). When we finally down the first boss and loot the chest, I check the tank again...and I wish I didn't. He had swapped from his lvl 56 vendor gear on his left side to lvl 53 dungeon gear. I'm fairly certain it doesn't give you as much hp and defense as 56+ gear does, though if I'm wrong someone correct me with ye olde napkin math.
I start playing it more and more safe with the tank when they continue to stance-dance up to the second boss. Hoo boy. I pointed out a few things about the boss to the smn before the tank could pull, and the Bull boy fight starts off normally enough to phase change. However the minute he starts opening up tears and dropping his balls around the arena is where things go south. Second knockback after he dumps 4 tears somehow the tank eats 4 vul stacks, and nearly dies. During this time the war tank is still stance-dancing when they really shouldn't be.
The second the gravity well hits the floor, the ninja, of all people in our group, moseys on over and manually pops them himself. Yes, a dps eating a perfectly dodgeable aoe that the tank really should pop themselves. Third knockback everyone but me eats more vul stacks, leaving the ninja at 4, smn at 3, and the war tank at a whopping 8 stacks. The icing on the cake was when the boss drops yet another ball on the floor and the ninja, sitting at half-health, runs over to pop it.
Needless to say he died instantly. I hit my macro to swiftcast res the ninja and get him back up, and suddenly the war went from 3/4 health to dead from a frontal cleave. She hit Holmgang too early and I couldn't save her, on top of being in Deliverance. We wipe and respawn, and reminded them that everyone needs to watch where they get knocked back to avoid getting vul stacks from tears, otherwise having that many makes it pretty much impossible for me to save you. Second run goes better (tank still got 4 vul stacks, but it's a lot better than 8). We open the chest and suddenly our tank is off sprinting, but stops for every trash pull and continues to do this to the final boss.
I inform the party about the mechanics to watch out for (run away if you're chained, dodge ground aoes and chess knights), and for the most part it goes smoothly until the last 10%. Somehow server ticks were still working on the smn when the chain broke and left him at critical hp and he immediately got deleted with Altar Pyre. And yes, during this time the war was still stance-dancing at the worst possible times, so almost the entire boss fight I couldn't even pop off a consistent Combust since I was busy healing.
I ended up comming the ninja for being a real trooper though.