Originally Posted by
[-Spiritus-]
Theoretically, you could squeeze 8 shields w/ a cancel cast of DH within the window, which would save 12,601.08mana on 8shields(in IF). If 7, 11025.95. DH costs 7412.4 mana. If your goal is to cast x7/8shields, then cancel casting DH is less in net mana than not cancel casting DH. So, the only question would be, does DH resolve more damage than 7/8 PW:S, from a pure HPS standpoint.
But, again, assuming Disc will even trigger the 2pc w/ DH in live version of the set.