I was running Aurum Vale to level my WHM (RIP SCH), and our paladin tank had no concept of healing threat. Every pull he'd tunnel-vision a single mob, while the others would be drawn to my Cure I and Regen threat like moths to a flame. After our fourth wipe I asked him to spam some AoE threat in a friendly way, and he indicated that he shouldn't have to "if everyone focused my target." I tried to explain that my heals generated AOE threat, but he was skeptical. We wiped again and he begrudgingly started slinging around flash; our unending reign of dying magically ceased.