It was several months ago. I was spirit bonding i70 stuff for to get Savage Might IV materia for my Novus. I was playing Healer to get faster queues with gear that would still be useful.
It was late, and going to be my last run of the night. Halatali HM popped. Group was WAR, WHM (me), BRD, and MNK.
Tank decided to try an pull the entire first floor burning his CDs on the run alone.
I opened with Divine Seal and Presence of Mind Cure II, Regen, Cure II, Medica II, Cure II burned the Benediction, Cure II twice more and the tank died, we wiped.
After the Benediction, the tank went from full to 10% in 2 seconds. There was just 0 time for getting Holy off to mitigate damage.
The tank never used Holmgang.
Comment from the tank "Learn how to heal."

I quit without responding, not worth the effort. Late at night, tank did not pay attention to group make up, wasted his CDs and was a jerk in the chat.