Well I guess you have to decide whether the ability being a cool class thing you may want to take someone along for (sort of like but different to how you'd take a monk with an urn or a necromancer to wipe recover) working as advertised is what you want, or whether you feel the need to include some terrible classic EQ "The Vision" sadism element to it if/when you fix it to clear aggro. Making it have an enormous cast time would make it near useless to do what it's supposed to be used for: Seeing you're going to wipe and preventing it at the cost of progress in possible progress through a dungeon or whatever. A good example is if you hit it in say, emberflow, chances are you're re-clearing.
You don't have to add a shitty side effect to everything. It's not like there aren't concessions to make the game less of a chore to play than classic EQ was elsewhere in this game, like for example corpse runs don't exist and neither does de-leveling. And I can't really think of any way to abuse this to gain anything, really. All evac spells should ideally clear targets from the hate list if possible. The draw of the AA versions is really supposed to be that they are near instant and cost no mana but have a significant reuse time.