That doesn't explain when doing something like Haukke Manor I can be stunned by Dark Mist when I'm half way accross the room. If I'm still in the AOE by the time the cast bar finishes then why am I still aloud to move all the way to the other side of the room by the time the stun hits? The effects of AOE need to be way more instant. This is just deceptive and leads to (understandable) suspicion of server lag.
I hear you. All too often I run out of Dark Mist only to be frozen in place BEHIND the healer. Same dang thing in Copperbell Mines on the last boss when I'd run out of the circle.