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, 20 September 2011
Yasuki Tsujiken Reaction: After Tsujiken enters play, target a Holding: Until Tsujiken leaves play, after each time its controller bows it, he loses 1 Honor. Open: Bow Tsujiken and target a Holding: Straighten it. You may bow it if its base Gold Cost is 4 or lower.
My question is fairly straight forward; if my opponent buys Tsujiken and targets one of my holdings with the entering play react and then uses Tsujiken's Open ability on my turn targeting the same holding, does that trigger the honor loss? I am not sure if the portion of the text which states "its controller" is specific to me bowing my own holding to pay a cost or use an ability, or if it just means I control it but it becomes bowed from any source. I also am not sure if my opponent can directly bow my holding or if the ability makes me bow my holding. Usually this would be a moot point, either way the card is bowed, but in this case it appears to be relevant. Thanks for any light you may be able to shed on this.
Zen Faulkes (rules official), 20 September 2011
(I)f my opponent buys Tsujiken and targets one of my holdings with the entering play react and then uses Tsujiken's Open ability on my turn targeting the same holding, does that trigger the honor loss?
No, because your opponent is not the holding's controller. A card is controlled by the person who brought it into play (http://rules.l5r.com/CE_Physically_mark ... rd_control). And while normally only the controller can bow a card, being able to do so because of card text doesn't automatically make your opponent the controller.
I am not sure if the portion of the text which states "its controller" is specific to me bowing my own holding to pay a cost or use an ability, or if it just means I control it but it becomes bowed from any source.
Specific to you. If it was "any source", it would just say "after each time it bows", rather than, "after each time its controller bows it."