Quote Originally Posted by Krisom View Post
The second problem with Surecast is that when you begin to cast a spell, the effect wears off. I am unsure if this affects the knock-back or not but it's very likely it does in a way that it wouldn't work any longer.
It's stupid, but Surecast's knockback canceling effect ends the moment you begin to cancel a spell. You have to hit Surecast and eat the hit before you cast your next spell. You can cancel every single Vacuum Wave, for example, in the last floor of Omega with good timing. Instant procs also don't count as casts as far as I can tell, so you can fire those off and still be immune to knockback.