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, 13 May 2014
Did a search and didn't find too much other than targeting. I have a battle with 2 tacticians and my opponent as his first battle actions drops Come one at a Time and wants to duel one of my guys. Can i react with The Sun Returns to negate the playing or effects of the terrain or would i just cancel the effects of the 1st duel off the terrain? If the battle action on terrain is negated does the card remain in play?
Come one at a Time: While there is exactly one defending Personality here, he has the ability, "Repeatable Battle: Challenge a target enemy Personality. Destroy the loser" and each player has the ability, "Repeatable Battle: Move home your target attacking Personality. Bow him as he moves." Battle: Destroy a Terrain (if able). Put this Terrain into play. Take an additional action granted by it.
The Sun Returns: Bow your target unbowed Tactician. Negate the effects of a Battle or Engage action.
Jon Palmer (rules official), 13 May 2014
Did a search and didn't find too much other than targeting. I have a battle with 2 tacticians and my opponent as his first battle actions drops Come one at a Time and wants to duel one of my guys. Can i react with The Sun Returns to negate the playing or effects of the terrain or would i just cancel the effects of the 1st duel off the terrain? If the battle action on terrain is negated does the card remain in play?
Come one at a Time: While there is exactly one defending Personality here, he has the ability, "Repeatable Battle: Challenge a target enemy Personality. Destroy the loser" and each player has the ability, "Repeatable Battle: Move home your target attacking Personality. Bow him as he moves." Battle: Destroy a Terrain (if able). Put this Terrain into play. Take an additional action granted by it.
The Sun Returns: Bow your target unbowed Tactician. Negate the effects of a Battle or Engage action.
You can choose to Interrupt either the playing of the terrain, or the challenge action taken.
If you do the former, the terrain never enters play. If you do the latter, that challenge is negated, but the terrain remains in play and can be used for its actions.