Human Paladin: Apprentice’s Global reads:
Global: Pay [1 Shield] . Reduce the damage you take from a character's ability to 1.
Storm: Wind-Rider reads:
When fielded, reroll up to 2 opposing characters. Each die that does not roll a character goes to your opponent's used pile. Storm deals 2 damage to your opponent for each die moved.
When do I pay for the Global Ability? Should I do it before Storm rerolls if I want to, even though it might not deal me damage? Should I do it after the reroll to see which characters return to the field? Or can I use either?