Quote Originally Posted by TeddyPrime View Post
It's probably because you're moving around during the battlefield and you have your fairy on follow. The fairy will not cast anything when it's moving around. That's why I usually place the fairy at the tank and away from AoE.

I also urge all SCH to take their time to level up THM and get swiftcast, it helps out so much in primal fights and instances when other people mess up.
I always noticed my fairy would just stop moving and heal someone instantly even when Im moving, but I think if you get out of a certain range, she will catch up to you first before she continues healing, so that could be it.