This happened a few days ago in Manor Normal, during my Mentor Roulette.
The tank was a leaf Gladiator, synced to the maximum lvl of 31 for that dungeon. Unsynced, he was lvl 38. Immediately, I have warning bells going off.
He then proceeds to facepull the first Sucubus and the pack behind it, and then proceeds to spam uncomboed Rage of Halones and Riot Blades on a single target. No flashing, no cooldowns, just Rage and Riot. Threat is flying everywhere, and I'm trying to ask him to stop so that I can at least try to explain what he's doing wrong. Eventually, he runs ahead while I'm typing, and dies. When he rezzes, I ask again for him to stop, and he does. I explain how the combo system works, about chaining skills in order to produce certain effects, and how to flash to generate threat on multiple targets.
His response is "lol..", and then he proceeds to pull the next group and spam uncombed Rage and Riot.
I cracked, and told him that I would not heal him until he started using his skills correctly. He died, and then left the instance. We got a replacement tank, (and dps since one of the dps was lagging, and left after the tank abandoned), and the run went smoothly.
I'm not happy with myself, but lets face it, as a healer, you can't heal stupid.
