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 July 2008
Wow, players have been trying to abuse this card for a long time, so I apologize if this is too much of a repeat. Now, my question is how would Bayushi Tomo interact with Wounded in Battle, which states that Samurai are not destroyed for having 0 Chi. I'm going to assume that Tomo still may not give herself infinite Force since her Chi cannot go below zero and she cannot pay the cost, even if she's able to remain in play with zero Chi. Just wanted to make sure, thank you.
[Mod edit: Thread title. -ZF]
Zen Faulkes (rules official), 26 July 2008
(H)ow would Bayushi Tomo interact with Wounded in Battle(?)
The ability can be used until you hit 0C. Then you can't use it any more, because you cannot make Chi drop the required -1C to pay the cost. It will be rounded up to 0.