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, 30 July 2007
Can Yoritomo Kurei use his ability, even if he is bowed, to move himself into a battle?
Relevant Text: Battle: Even if Kurei is in your home, pay 3 Gold: Move one of your target Naval Personalities to a battlefield with one or more enemy units. If he moved, straighten all cards in his unit.
Zen Faulkes (rules official), 30 July 2007
Can Yoritomo Kurei use his ability, even if he is bowed, to move himself into a battle?
Relevant Text: Battle: Even if Kurei is in your home, pay 3 Gold: Move one of your target Naval Personalities to a battlefield with one or more enemy units. If he moved, straighten all cards in his unit.
Comprehensive rules, using abilities: "Abilities on bowed cards can not be used."