When do you pay the X power cost for Bullet Time's effect - before putting it on the chain or during resolution?

Ruling: You pay the power cost during the resolution of Bullet Time, not before putting it on the chain.

Sequence:

• Bullet Time is played and goes on the chain
• Bullet Time resolves
• During resolution, you pay X power and deal X damage (no additional window to respond)

Nuances:

• The payment does not use the chain a second time
• It is not a reflexive trigger, so there is no window for the opponent to respond between paying the cost and dealing the damage
• The card does not say "as an additional cost" which would require payment before putting it on the chain