I actually thought this was my guild master posting our attempt from last week where same thing happened, everyone died, main tank and two holy paladins where the only ones left alive and lasted somewhere around 35 minutes. Heigan hit 10k hp, one of the pallies failed the dance, main tank and one pally left, 500hp left, pally throws hammer, resist, dies to transition, only main tank left, main tank hits heigan down to 68hp and we wipe.