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, 8 October 2014
Hi. Just to confirm my understanding.
Under page 26 "Taking actions" in the Ivory Comprehensive Rules PDF, Interrupt actions are announced during a non-Interrupt action.
Question: Can I play an Interrupt action in response to an Engage action?
E.g. Attach Legacy of Tadaka spell to Kuni Araizen as an Interrupt when Sneak Attack is played.
For your reference:
Kuni Araizen Earth Battle: Bow Araizen's target unbowed Follower or Spell to make a Melee Attack equal to Araizen's Chi.
Legacy of Tadaka You may Equip this Spell as an Interrupt.
Sneak Attack Engage: The Attacker has the first opportunity to take a Battle action or pass in this battle.
Thank you for your attention!
Alex Jones (rules official), 8 October 2014
Hi. Just to confirm my understanding.
Under page 26 "Taking actions" in the Ivory Comprehensive Rules PDF, Interrupt actions are announced during a non-Interrupt action.
Question: Can I play an Interrupt action in response to an Engage action?
E.g. Attach Legacy of Tadaka spell to Kuni Araizen as an Interrupt when Sneak Attack is played.
For your reference:
Kuni Araizen Earth Battle: Bow Araizen's target unbowed Follower or Spell to make a Melee Attack equal to Araizen's Chi.
Legacy of Tadaka You may Equip this Spell as an Interrupt.
Sneak Attack Engage: The Attacker has the first opportunity to take a Battle action or pass in this battle.
Thank you for your attention!
The only type of action that you can't Interrupt is Interrupt.
You may Interrupt Engage actions (The Sun Returns wouldn't work if you couldn't).