Can you float power/energy during the resolution of an ability like Bullet Time, even when the ability doesn't require you to pay that resource?

Ruling: Yes, you can float power and energy during the resolution of abilities, even if those abilities don't require you to pay those resources. You can use [reaction][add] abilities (like tapping runes for energy or recycling runes for power) anytime you can play a reaction or are asked to pay costs.

Sequence:

• During Bullet Time resolution, you can tap runes for energy before recycling them
• The rule about using add abilities "to pay costs" provides an additional window to activate these abilities, not a strict requirement that costs must exist

Nuances:

• Power and energy float until the next time your rune pool empties
• The "to pay costs" language in the rules is not a limitation - it simply indicates an additional timing window when these abilities can be used