
Originally Posted by
Valena
If you want to cancel a spell quick, 2 ways to go :
Move your character a bit, you don't have to go very far. This is not 100% success, especially for fast casting spells, of if your character has some access to Fast Cast.
Enter healing mode, the shortcut is with h button of the keyboard. 100% sure of interruption, but the animation of siting and standing again will freeze you a bit.
Latter method is best for the long casting spells since cast mode will be disabled immediatly.