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, 4 January 2012
Text bits: No Hiding Place Reaction: After you announce an action with a Ranged Attack: Give one Ranged Attack from the action -1 strength. That Ranged Attack may target a card in the Defender's home (if otherwise legal).
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 action that may only target the same card."
So, let's say I'm assigning a couple of personalities with Battle: Ranged 5 Attack and my opponent has a 9F dude in his home I want to kill. I react to assigning with Koshin Keep. My first battle action is a No Hiding Place to RA4 my opponent's dude. Due to the text of Koshin Keep, since my RA4 did not kill the personality at home, can I take my RA5 against the personality at home?
Koshin Keep says nothing about "same target, if legal" so we've been playing like it does allow the subsequent attack to target the same dude at home. This has angered some local players so I'm asking here.
Jon Palmer (rules official), 4 January 2012
Text bits: No Hiding Place Reaction: After you announce an action with a Ranged Attack: Give one Ranged Attack from the action -1 strength. That Ranged Attack may target a card in the Defender's home (if otherwise legal).
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 action that may only target the same card."
So, let's say I'm assigning a couple of personalities with Battle: Ranged 5 Attack and my opponent has a 9F dude in his home I want to kill. I react to assigning with Koshin Keep. My first battle action is a No Hiding Place to RA4 my opponent's dude. Due to the text of Koshin Keep, since my RA4 did not kill the personality at home, can I take my RA5 against the personality at home?
Koshin Keep says nothing about "same target, if legal" so we've been playing like it does allow the subsequent attack to target the same dude at home. This has angered some local players so I'm asking here.
"May only" is used as a restriction, not a permission. In this case, Koshin Keep will not allow you to overcome the normal targeting restrictions on a Ranged Attack (you could, of course, play an additional No Hiding Place).