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, 31 May 2008
Shosuro Nikai Scorpion Clan • Ninja • Unique Ninja Limited: Create a battlefield (not at any province). Assign Nikai to attack there. Assign another player's target unit to defend there, even if its Personality is bowed, and straighten it. Fight a battle there. No other units may move there. After the battle ends, lose 3 Honor.
Geisha Escort (follower) Can only attach to a ninja or courtier. Personalities opposing this card cannot straighten. If Nikai has Geisha Escort attached when ambushing someone, will the defender straighten ?
Alex Jones (rules official), 31 May 2008
Shosuro Nikai Scorpion Clan • Ninja • Unique Ninja Limited: Create a battlefield (not at any province). Assign Nikai to attack there. Assign another player's target unit to defend there, even if its Personality is bowed, and straighten it. Fight a battle there. No other units may move there. After the battle ends, lose 3 Honor.
Geisha Escort (follower) Can only attach to a ninja or courtier. Personalities opposing this card cannot straighten. If Nikai has Geisha Escort attached when ambushing someone, will the defender straighten ?
No.
At the time when the effect "straighten [the defending personality]" occurs, Nikai's Geisha Escort is opposing the defending personality, so the defending personality cannot straighten.