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, 30 October 2007
Hi,
There are currently a large numbered of unanswered questions posted on here basically asking the same question. How do effects that create additional actions interact with reactions? I have a tourney coming up where this will likely happen.
If I have a reaction to "TRIGGER X" that creates an additional battle action (say Bayushi Muhito). And that battle action creates an additional battle action (say Resumed Hostilities). After that chain of actions, can I still go back and react to "TRIGGER X" with a 2nd reaction? If not, then when is the appropriate time to react with the 2nd reaction?
Bayushi Muhito Reaction: After an action resolves that moved Muhito to or from a battlefield: Take an additional Battle action.
Chris Fuchs (rules official), 30 October 2007
http://rules.l5r.com/Glossary_A#Additional
2. Some effects grant an “additional” action of a given type (usually Battle, Open or Limited).
A granted additional action does not count against the normal sequence of actions in the current segment or phase; for example, an additional Battle action is taken immediately without waiting for, or expending, the next normal chance to take a Battle action.
Whenever an effect grants an additional action while another action of the same designator is in progress, the timing of the additional action is delayed until after the current action resolves. This makes sure that Battle actions can not occur within other Battle actions, and so on. ["After" ADDED August 14 2007]
A granted action opportunity can be used to pass.