The spell says you remain in combat but it doesn't, what does this mean? Priests have a way to drop combat!
This allows you to drop combat and start drinking in the middle of a fight make sure you dispel any DOTs you might have and drink up while you have an enemy Line of sighted or CC'ed.
I also find use for this as a miner I can drop onto a node surrounded by NPCs, Fear, Mine, then drop combat and mount up to move on.
I know other classes can break combat sometimes but this gives priests their own way. Plus it's every 30 seconds that you are able to do this!
This may not seem like much but the spell does say it keeps you in combat, which it doesn't.