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 September 2012
Hida Osote: After the first time each turn another player's action targets your Crab Clan Personality at Osote's location: The player discards a card after the action ends.
Yoritomo Taroa: Open: Pay 2 Gold: Choose a player. He targets one of his unbowed Personalities or Holdings or a card in his hand. If the targeted card is in his hand, discard it. Otherwise, bow it.
IF i use Taroa's ability to target my opponent and they choose a personality to bow do I have to discard a card due to Osotoe's reaction?
Alex Jones (rules official), 30 September 2012
Hida Osote: After the first time each turn another player's action targets your Crab Clan Personality at Osote's location: The player discards a card after the action ends.
Yoritomo Taroa: Open: Pay 2 Gold: Choose a player. He targets one of his unbowed Personalities or Holdings or a card in his hand. If the targeted card is in his hand, discard it. Otherwise, bow it.
IF i use Taroa's ability to target my opponent and they choose a personality to bow do I have to discard a card due to Osotoe's reaction?
Yes, because your action targeted his Personality at Osote's location.