If you'd have turned of Blessing of Freedom in the tooltip, it'd stop casting, or untick yourself in raid popup, same result. You can also tell it to not learn the spell in future.
Except Blessing of Freedom is nowhere to be found. I checked under selfbuffs and "bufftehraid" where the rest of my blessings are, and could not locate it. Hard to tell it not to learn the spell if it's not presented as an option.
It's been a crazy week, and raids are almost done with. I'll give it another try this weekend when I wipe all my mods and start over. At least then I won't be pissed off because I'm tanking hyjal waves and removing my kings constantly. :)