Timing on Crimson Dynamo's Disruption Field Super Power

[newmutant37]

When does Crimson Dynamo need to declare the use of his Disruption Field power? Is it done as soon as someone is targeted, before any dice are rolled? Or do you get to see the result of the dice before paying for the power to reroll?

[Thoras]

This superpower is used during the targeting step, so it is used before any dice are rolled.