Thats why i was saying you could "cancel" the effect, so if the fight is just 1 boss, no adds, pop it when its up, and turn it off imediately. (unless you want the heal to reflect how long its been active, then canceling it at the last second gives the biggest heal)
The act of turning it off, puts it on CD, and heals HP only, comparable to the current amount, maybe less if its based on how long its been on the enemy.
