Can runes being recycled to pay for Bullet Time's power cost during its resolution also be tapped for energy at the same time?

Ruling: Yes, you can tap runes for energy at the same time you recycle them to pay for Bullet Time's power cost during resolution. Any Add ability with Reaction speed can be used during the resolution of a spell when paying costs.

Sequence:

• Pay 1 energy to cast Bullet Time and choose a battlefield
• Both players get reaction windows (opponent first, then you retain priority)
• Once both players pass and the spell resolves, you declare the amount of power and recycle runes
• During this resolution payment, you can tap those runes for energy before recycling them
• At this point, the opponent cannot react with Defy or other responses

Nuances:

• The opponent never gets to react to Bullet Time with knowledge of how much damage it will do, since the power cost is paid during resolution, not as an additional cost to cast
• You can cast Bullet Time with no intention of recycling any runes
• This applies to any Add abilities with Reaction speed, not just energy generation