found this out messing on a druid I made. I was casting Wrath, and when the timer got near the end, I tapped the down botton. It casted it before the timer was full. I got it to about 80% of the way done, about a half a centimeter from end on my screen. And it worked again and again. Might be uselful, also might only work w/ quick spells, like Wrath (rank 1).