Originally Posted by
Yunzi
In an immediate emergency with penance down and weakened soul there's no other choice than flash heal (coupled if necessary with pain suppression). But in a similar situation where the player's going to live a bit longer clarity of will is better for both mana efficiency and avoiding sniping - probably 1 or 2 other healers are also healing that player and the CoW doesn't get in their way as they fill the health bar back up.
Comparing the realistic problems of casting CoW versus FH there gives us strengths and weaknesses for both - if the player dies during the cast Flash Heal is better since there will be less lost time. If the player receives a Lay on Hands or otherwise blast sniping heal Clarity of Will is better, since it avoids some overhealing.
Regardless of that, when 32 Flash Heals are cast on a single pull there are bigger problems that should be dealt with - either a lack of trust in other healers, a lack of healers, poor following of mechanics to take unnecessary damage, and the like.