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, 26 November 2007
Relevant Text: Hida Sozen Exp Other players' actions can not destroy Sozen.
Strength in Shadow Style If your Personality in this duel is Scorpion Clan: Lose 2 Honor. Give a Personality in the duel two -1F/-1C poison tokens. (End the duel without resolution if this destroys him.)
As I understand it, Focus effects are not actions. They're card effects. Thus, if I used chi reduction to get him to 2 or below, dueling him with Strength in Shadow Style would kill him, correct?
Zen Faulkes (rules official), 26 November 2007
Hida Sozen Exp: if I used chi reduction to get him to 2 or below, dueling him with Strength in Shadow Style would kill him, correct?
Yes.