All can test it. Bigger casting speed, easier to see. 1)Turn on automatic blessed spirit shots.2)Hit with magic skill. Everything is okey m atk and casting speed is increased. Now try to do the same and spam magic skill. For first shoot you will get m atk + casting speed. For second magic skill only m atk, HALF OF THE CASTING time you dont get casting speed. Very easy to see with +wit. I know there was called shot delay in server or something, but i dont think it should be here, because for fighters it works properly + if u wait a bit u cast second skill as fast as first one. It looks like shot is applied only at the end of the skills casting time.