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.
Can Shiba Daizan's reaction save a shugenja in a battlefield even if Daizan is dead?
Reaction: Before another player's action destroys one of your Shugenja in your home or at Daizan's battlefield, even if Daizan is dead, remove him from the game: Negate the Shugenja's destruction.
Thanks.
Can Shiba Daizan's reaction save a shugenja in a battlefield even if Daizan is dead?
Thanks.
No.
If Daizan is dead, he is not at a battlefield, and thus no Shugenja are at a battlefield with him.