
Originally Posted by
Baha
Oh, and for mandies, recast between their two swings, works every time. Figured you'd run into them soon enough.

This is actually valid across the board:
Every spell interruption check is performed at the very very beginning of the enemy's attack, when they switch from 'idle' animation to 'attack' animation. Start casting when the mob draws its weapon back or begins its attack, and even if it hits you full on crit double attack w/e, as long as you started casting after their animation began, your spell will go off seamlessly.
This includes slow hitting mobs like Gigas, Start casting at the first hint of their windup, and you'll be fine even if the visible effect hits you at 40% cast time.