We went and had one of my very first runs in a dun as a healer myself, with my friend playing her DRK, I AST my arse into Stone Vigil.
So I heard there are moments when the damage peaks up, guess the rumors were true. We reached one of the mobs after the 1st boss, it was a set of 3 monsters in a circle room after a flight of stairs that can get firebombed by that trolling wyvern :/
Everything was going alright, so I saw no problem on playing a bit with Cleric Stance to throw a DoT here and there. However, unknown to me when, an Aevis patrol joined the fray to back up on the currently still 3-monsters mob, and started chewing on my DRK friend's HP amidts the cooldown of one too many DoTs I was throwing in.
Dropping CS, I quickly selected her and went for a heal (which I don't remember the name of but its the first one), 1 second into the cast the thought of "shit, I should've Swiftcasted this" ran into my mind, but I quickly brushed it off since canceling would've been a worse idea. Then the wishful thought of "make iiiiiiit" flashes in my mind and my sight blurres for a second to when I suddenly see my friend's HP drop to 0.
Mind on blank, panic starts surging up as a wipe looks imminent, specially with a greenhorn healer like myself. Pulling myself together in a fraction of a second, first thing in the book says "res the Tank", good. Unbelibably enough, I still had my DRK friend selected so I proceeded to Swiftcast and tripple check her being selected and the Res button that for the very first time had an use for.
Res falls on her and I notice the red of 4 monsters on me. "oh shit" Sprint away and start running in big circles. both DPS took big hits and the Tank is still standing up. Lightspeed was ready so my instincts urged me to tap on it. As soon as it came into play AoE heals were cast off to keep the party up, and by quickly retargetting the Tank threw some more focus heals.
The party recovered from that and we downed the 4 mobs pulling out of a likely wipe by the hair of a bald frog...
So that was my first taste of a Healer Horror... and it was fully my fault... this job is stressful D: