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.
Consuming the flesh states: Reaction: After another player's action targets one of your Personalities in your current army, destroy the Personality and bow this card: The action's effects do not happen. Create a 2F/2C/0PH Shadowlands • Undead Personality at the current battlefield. Lose 3 Honor.
Can you use this reaction if the Shugenja is either at home or not at the current battle field and the target is in the current battlefield?
Consuming the flesh states: Reaction: After another player's action targets one of your Personalities in your current army, destroy the Personality and bow this card: The action's effects do not happen. Create a 2F/2C/0PH Shadowlands • Undead Personality at the current battlefield. Lose 3 Honor.
Can you use this reaction if the Shugenja is either at home or not at the current battle field and the target is in the current battlefield?
Yes, you may. Reactions do not follow the Rules of Presence and Location.
The trigger states that the person being targeted (and destroyed) by Consuming the Flesh must be at the current battlefield, however.