Cinder Drift (SCH).
I noticed that the healing pressure was getting really intense during phase 2, and when the other healer (WHM) died i noticed that the pressure didn't really increase until the last phase. Then on the next pull i looked over and noticed her just casting a bunch of cures...not cure 2's...cures... only cures. We wiped again to the comet's pulsing damage on all the dps because i just couldn't keep up on my own.
The healer mysteriously d/c'd after that, so we took the opportunity to just give her the boot. Got another WHM after that who was brand new, and i told her right off the bat "Just familiarize yourself with Medica and it'll be great", and it was. Went perfectly. Nobody died.
Like, how do you get a healer to level 80 and not learn anything about it. Even for a boosted character.