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.
Ikoma Yasuko Political Reaction: Before another Lion Clan Personality is destroyed, destroy Yasuko: Negate the Personality's destruction.
If Yasuko is in an army with another personality, and her army loses the battle, can she use her ability to negate the destruction of the other personality from resolution?
Ikoma Yasuko Political Reaction: Before another Lion Clan Personality is destroyed, destroy Yasuko: Negate the Personality's destruction.
If Yasuko is in an army with another personality, and her army loses the battle, can she use her ability to negate the destruction of the other personality from resolution?
Yes, she can use her ability before she would be destroyed herself.
(Note: since neither Yasuko nor the protected personality are destroyed by battle resolution, your opponent will gain no honour for destroying them.)