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, 21 September 2008
Code: Select all Once an action or triggered trait starts, apply all its costs, targeting, and effects in sequence before proceeding, even if another action or triggered trait is under way.
The above is from the Comprehensive Rules on timing. Shouldn't the sequence be Targeting then costs? Since some actions have variable costs dependent on targeting, how could one pay said costs without having selected its targets? The rulings on Hired Killer seem to bear this out.
Brook Cunningham (rules official), 22 September 2008
Code: Select all Once an action or triggered trait starts, apply all its costs, targeting, and effects in sequence before proceeding, even if another action or triggered trait is under way.
The above is from the Comprehensive Rules on timing. Shouldn't the sequence be Targeting then costs? Since some actions have variable costs dependent on targeting, how could one pay said costs without having selected its targets? The rulings on Hired Killer seem to bear this out.
Well, that sentence you quote isn't deliniating the proper sequence; it's just a list. This is the section that does:
http://rules.l5r.com/Abilities_and_actions#Using_abilities
While the sentece could have listed those steps in their sequential order, it's no less accurate than saying: "Address each preschooler, baby, and teenager in order of youngest to oldest."