Can you cast Discipline in response to Bullet Time after seeing how many runes the opponent recycled for it?

Ruling: No, you cannot cast Discipline after seeing the amount of damage Bullet Time will deal. Your opponent pays power as Bullet Time resolves, and you can never interact knowing the amount of damage it will do.

Nuances:

• Bullet Time differs from cards like Falling Star, which uses a reflexive trigger that selects targets after resolution
• This same principle applies to other cards like Get Excited, where the discard happens after the card resolves