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, 21 May 2010
Very simple. If I'm attacking as crab and use sneak attack leading to hida's guidance's ability to destroy the Celestial and the army to destroy the province... what happens if my opponent uses Reinforce the Gates? I imagine that I would lose my army and the celestial because they are a part of the cost of the action, but the province of course would not be destroyed.
Is this the case? With reinforce the gates it says you use it after the action is announced. This is before costs are paid right? So if that is the case then do I also keep my guidance?
Hida's Guidance: Kami • Unique Crab Clan players' provinces have +2 strength. Battle: If you are an attacking Crab Clan player, the Defender has 2 or more provinces, and your current army's total Force is greater than the current battlefield's province's strength, destroy all your Personalities there and discard this card: Destroy the province and end this battle without resolution.
Reinforce the Gates: Reaction: After a player announces a Battle action before the Defender’s first normal opportunity to act or pass: Its effects do not happen.
Alex Jones (rules official), 22 May 2010
Very simple. If I'm attacking as crab and use sneak attack leading to hida's guidance's ability to destroy the Celestial and the army to destroy the province... what happens if my opponent uses Reinforce the Gates? I imagine that I would lose my army and the celestial because they are a part of the cost of the action, but the province of course would not be destroyed.
Is this the case? With reinforce the gates it says you use it after the action is announced. This is before costs are paid right? So if that is the case then do I also keep my guidance?
Hida's Guidance: Kami • Unique Crab Clan players' provinces have +2 strength. Battle: If you are an attacking Crab Clan player, the Defender has 2 or more provinces, and your current army's total Force is greater than the current battlefield's province's strength, destroy all your Personalities there and discard this card: Destroy the province and end this battle without resolution.
Reinforce the Gates: Reaction: After a player announces a Battle action before the Defender’s first normal opportunity to act or pass: Its effects do not happen.
You still have to pay the costs.
Note that, unlike with Dramatic Assassination being redirected, the section under Interference with mandatory costs doesn't apply, since there's no interference with any of the costs.