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, 2 June 2014
Aramasu's Mask refers to just negating an action, so could I use it to negate an interrupt played by my opponent during the interrupt step of resolving the Battle action assuming the interrupt is from an action on a Fate card? For instance if I have used Tactical Advantage with a 3 Focus Value card can I then negate The Turtle's Shell?
Relevant Text: Interrupt, (bow) : Negate an action from a Fate card with the same Focus Value as a card discarded by this Personality's Tactical Advantage action this turn.
Alex Jones (rules official), 2 June 2014
Aramasu's Mask refers to just negating an action, so could I use it to negate an interrupt played by my opponent during the interrupt step of resolving the Battle action assuming the interrupt is from an action on a Fate card? For instance if I have used Tactical Advantage with a 3 Focus Value card can I then negate The Turtle's Shell?
Relevant Text: Interrupt, (bow) : Negate an action from a Fate card with the same Focus Value as a card discarded by this Personality's Tactical Advantage action this turn.
Interrupt actions are not themselves interruptable. Aramasu's Mask cannot negate The Turtle's Shell.