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 October 2012
Does the effect on Shosuro Aroru Exp 2's Battle action ("Other players may not take Reactions until this action ends") extend through to any additional Ranged Attack Battle actions granted by Koshin's Keep?
I would think so since the granting of an additional ranged attack by Kioshin Keep is an effect added to Aroru's Ranged 5 Attack, and thus must resolve completely until Aroru's battle action resolves.
Example: I have Shosuro Aroru Exp 2 in Play with a Seige Volley in Hand. My opponent has a 9 Force Beserker and a Precision in hand (why Beserkers would play Precision, I don't know). I used Koshin Keep Reaction upon engaging. I announce Shosuro Aroru ability to target the Beserker with the Ranged attack and follow up with Seige Volley. Can my opponent every play his Precision (or even react with his box to delay the destruction for that matter)?
Koshin Keep Recon Reaction: After engaging: You have Reconnaissance at the current battlefield. Until this battle ends, your Ranged Attacks that do not destroy their target have the additional effects, "reduce the target's Force by the Ranged Attack's strength and you may take an additional Ranged Attack Battle action that may only target the same card".
Shosuro Aroru Exp 2 Battle: Other players may not take Reactions until this action ends. Ranged 5 Attack.
Alex Jones (rules official), 28 October 2012
Does the effect on Shosuro Aroru Exp 2's Battle action ("Other players may not take Reactions until this action ends") extend through to any additional Ranged Attack Battle actions granted by Koshin's Keep?
I would think so since the granting of an additional ranged attack by Kioshin Keep is an effect added to Aroru's Ranged 5 Attack, and thus must resolve completely until Aroru's battle action resolves.
Example: I have Shosuro Aroru Exp 2 in Play with a Seige Volley in Hand. My opponent has a 9 Force Beserker and a Precision in hand (why Beserkers would play Precision, I don't know). I used Koshin Keep Reaction upon engaging. I announce Shosuro Aroru ability to target the Beserker with the Ranged attack and follow up with Seige Volley. Can my opponent every play his Precision (or even react with his box to delay the destruction for that matter)?
An additional action granted by one action is taken after the current action has finished and after effects and Reactions triggered by the end of the action have finished; the quoted effect ends such effects and Reactions are triggered..
See Additional Action: When an additional action is granted while a non-Reaction action is in progress, the timing of the additional action is delayed: the opportunity to take it happens once the current non-Reaction action has ended, and once the opportunity to play Reactions to the end of the action has passed.