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, 9 October 2010
If I play Test of Sincerity and want to react with my Only Actions Speak, does my opponent have to decide whether to seppuku his Personality or dishonor it before I announce the OAS Reaction or afterwards?
Test of Sincerity Open: Target another player's Personality. His controller may have him commit seppuku; if he chose this, he gains 4 Honor. If he did not choose this, dishonor the Personality, and his controller loses 2 Honor; if he is now below his starting Family Honor, he may ignore Personalities' Honor Requirements until the game ends.
Only Actions Speak Reaction: After an action is announced: Negate all Honor gains until after the action's resolution. At that time, if this negated any gains, negate all Honor gains until the end of this phase and draw a card
Zen Faulkes (rules official), 9 October 2010
If I play Test of Sincerity and want to react with my Only Actions Speak, does my opponent have to decide whether to seppuku his Personality or dishonor it before I announce the OAS Reaction or afterwards?
Chain of events:
1. Announce Test of Sincerity.
2. Trigger for Reactions to an action being announced... namely Only Actions Speak.
3. Pick target Test of Sincerity.
4. Pay costs for Test of Sincerity.
5. Start resolving effects of Test of Sincerity, which includes target Personality's controller choosing an option.