Can Defy cancel Bullet Time regardless of how much power is invested in it?

Ruling: Yes, Defy can cancel Bullet Time regardless of how much power is invested. Defy cares about printed costs (the power symbols on the top left of the card), and Bullet Time's X power cost is not a printed cost.

Sequence:

• If a player plays Bullet Time, there must be a response window before they specify the X amount of power
• If Defy is played in response, the opponent does not pay the power cost
• If the player already specified the X amount and paid power, it's too late to respond (though you can remind them they should have given a response window)

Nuances:

• The power cost for Bullet Time is paid at resolution, not when the card is played
• Players must provide a response window before dumping power into Bullet Time