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, 25 September 2009
Given situation:
Player A controls Moshi Chuuna and applies her Limited Action to a target a personality (Moto X, has the Cavalry trait) of Player B. (Limited: Bow Chuuna or one of her Spells: Target a Personality. After the next time this turn he assigns or moves to a battlefield, bow him.)
He then declares an attack and during one of the Battles, (let's assume there are units on both sides) , player B plays Cavalry Tactics, targeting Moto X, who hasn't assigned or moved to a battlefield yet this turn. (Battle: If any enemy units are at the current battlefield: Move your target Cavalry unit there. If it moved, straighten it and gain 2 honor.)
So, what happens exactly ?
That's what I'm assuming (simplified; just the crucial steps):
Effects will be activated in order as per the rules: "If mandatory costs and required targeting have been met, activate the action’s effects in order"
--> At first, the first effect of Cavalry tactics happens: Moto X gets moved to the Battlefield.
Then -as the trigger for Moshi Chuuna's Limited action is triggered now- the following rule kicks in: "Once a triggered action or trait starts, apply all its costs, targeting, and effects in sequence before proceeding, even if another action is under way."
--> Then, Moto X gets bowed due to the triggered action of Chuuna.
After that all the remaining effects of the original action (Cavalry tactics) are activated.
---> At last, Moto X straightens (as he moved) and Player B gains 2 honor.
Brook Cunningham (rules official), 25 September 2009
Given situation:
Player A controls Moshi Chuuna and applies her Limited Action to a target a personality (Moto X, has the Cavalry trait) of Player B. (Limited: Bow Chuuna or one of her Spells: Target a Personality. After the next time this turn he assigns or moves to a battlefield, bow him.)
He then declares an attack and during one of the Battles, (let's assume there are units on both sides) , player B plays Cavalry Tactics, targeting Moto X, who hasn't assigned or moved to a battlefield yet this turn. (Battle: If any enemy units are at the current battlefield: Move your target Cavalry unit there. If it moved, straighten it and gain 2 honor.)
So, what happens exactly ?
That's what I'm assuming (simplified; just the crucial steps):
Effects will be activated in order as per the rules: "If mandatory costs and required targeting have been met, activate the action’s effects in order"
--> At first, the first effect of Cavalry tactics happens: Moto X gets moved to the Battlefield.
Then -as the trigger for Moshi Chuuna's Limited action is triggered now- the following rule kicks in: "Once a triggered action or trait starts, apply all its costs, targeting, and effects in sequence before proceeding, even if another action is under way."
--> Then, Moto X gets bowed due to the triggered action of Chuuna.
After that all the remaining effects of the original action (Cavalry tactics) are activated.
---> At last, Moto X straightens (as he moved) and Player B gains 2 honor.
Your interpretation of the sequence is correct.
Carry on!