I've been guilty of all sorts of things healing :O

Wod/ct/st runs if my cohealer kept dying from staying in cs and dpsing at the wrong times, I'll let them lay dead and I don't rez them. I'll let them walk back after we clear the boss/mob or if they're fortunate a smn or another healer will Rez them. Same thing with dps and other alliance healers/dps dying over and over again from ignoring mechanics. Gitgud or walk the walk of shame back to your party, idc.

I'm also guilty of leeching/detrimenting the wrong players at times. Whoopsies.

If you repeatedly stand in avoidable aoe or stupidly stand with the tank getting cleaved in the face, I might let your health get really low to scare you into correcting the situation, or if it continues, let you die. I hate wasting my mana when I could be getting dps in.

If you pull something as dps, I'm going to let you tank it and not heal you unless it was obviously by accident.

If the dungeon starts and you run off while I'm casting protect and you are out of range for it, I'm assuming you don't need it that bad so I might let you die tanking a mob to the face if I can't keep up with healing and remind you to give me two seconds to cast protect before pulling the next time.