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, 7 November 2012
Chikushudo's Trickery Open: Choose one or two of your performing unbowed Nonhuman Spirit Personalities, target another player's unbowed Personality, bow this Shugenja, and destroy this card: Create a battlefield. Negate all movement to it. Assign the target to attack there; he will not be destroyed during the battle's Combat Segment. Assign the performing Spirits to defend there. Fight a battle there.
Shiba Sansesuke Reaction: When an action would target your Shugenja at Sansesuke's location, bow Sansesuke: The action targets him instead, if legal.
Ok, I'd like to know, if Sansesuke can jump in front of shugenja targeted by Chikushudo Trickery and take it on himself? I see a few possible options in her: 1) He can redirect this action on him, and will assign to attack bowed 2) He can redirect this action on him, but will not assign as he is bowed as cost of redirecting 3) He cannot as "another player's unbowed Personality" is required and in moment of redirecting Sansesuke is already bowed because this is a cost -> Target shuggie with CT, SS uses reaction, bows and is not legal target. It's a bit unclear to me now, so I'd be grateful for answer.
Alex Jones (rules official), 13 November 2012
Chikushudo's Trickery Open: Choose one or two of your performing unbowed Nonhuman Spirit Personalities, target another player's unbowed Personality, bow this Shugenja, and destroy this card: Create a battlefield. Negate all movement to it. Assign the target to attack there; he will not be destroyed during the battle's Combat Segment. Assign the performing Spirits to defend there. Fight a battle there.
Shiba Sansesuke Reaction: When an action would target your Shugenja at Sansesuke's location, bow Sansesuke: The action targets him instead, if legal.
Ok, I'd like to know, if Sansesuke can jump in front of shugenja targeted by Chikushudo Trickery and take it on himself? I see a few possible options in her: 1) He can redirect this action on him, and will assign to attack bowed 2) He can redirect this action on him, but will not assign as he is bowed as cost of redirecting 3) He cannot as "another player's unbowed Personality" is required and in moment of redirecting Sansesuke is already bowed because this is a cost -> Target shuggie with CT, SS uses reaction, bows and is not legal target. It's a bit unclear to me now, so I'd be grateful for answer.
The redirect fails for the reason you give in 3) - Chikushudo Trickery requires an unbowed target, and Shiba Sansesuke must bow as a cost of his action.