A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
A player, 2 April 2012
If I use The Perfect Moment: May I assign to multiple provinces? May I choose which one I destroy, or does it have to be the first one I win? Can I still destroy the defending army even though the province will not be destroyed? I believe that you can assign to multiple provinces and you can destroy armies if they defend. But, I believe that you cannot choose which province is destroyed, it will be the first one you have enough force since the card does not give you a choice. Please correct me if I am wrong.
(The question is because of a player who wishes to use Plains of the Maiden and wants to gain extra honor.)
The Perfect Moment Reaction: After the end of an Attack Phase in which you were the Defender: Create an additional Attack Phase with the previous phase's Attacker as the Defender. During this Attack Phase, you will not destroy more than one of the Defender's provinces, and your Personalities may not assign and will not move unless they are Paragons or Battle Maidens.
Jon Palmer (rules official), 2 April 2012
If I use The Perfect Moment: May I assign to multiple provinces? May I choose which one I destroy, or does it have to be the first one I win? Can I still destroy the defending army even though the province will not be destroyed? I believe that you can assign to multiple provinces and you can destroy armies if they defend. But, I believe that you cannot choose which province is destroyed, it will be the first one you have enough force since the card does not give you a choice. Please correct me if I am wrong.
(The question is because of a player who wishes to use Plains of the Maiden and wants to gain extra honor.)
The Perfect Moment Reaction: After the end of an Attack Phase in which you were the Defender: Create an additional Attack Phase with the previous phase's Attacker as the Defender. During this Attack Phase, you will not destroy more than one of the Defender's provinces, and your Personalities may not assign and will not move unless they are Paragons or Battle Maidens.
1. Yes 2. It must be the first one that meets the conditions for destruction 3. Yes