Talk:Optimized Prototype/@comment-2405:7F00:8808:C700:C4DD:96D6:27F3:A817-20180701114928/@comment-454133-20180701154913

Spending dice results happens during the relevant modify dice step. In the case of Optimized Prototype, you spend a die result during the Attacker Modifies Attack Dice step (same timing as Accuracy Corrector). Despite that timing, btw, spending results doesn't count as modification, so "Omega Leader" can't stop you.

In short, you spend the dice result before the defender rolls his dice, so you'll eliminate the shield before damage is done.