There are some legitimate uses of Fluid Aura in 4-man in stances. For example, after a tank has established enmity on a pack of mobs, the CNJ can identify a mob that no one is attacking and Fluid Aura -> Repose it. This is one less mob dealing damage on the tank which A) lessens the risk of the tank dying (the essence of a healer), and B) allows for increased DPS by the healer (ultimately leads to a faster run).