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, 24 April 2008
The phrase "can only" only seems to appear within the Cannot entry. Since "Assigning" is not listed as an exception under section 1 of Cannot, and the "can only" restriction on Retribution is found in card text and not in game rules text, does this mean that a Determination reacted Redeployment will allow the Retributing player to assign more than one personality during a Retribution attack? (Inspired by the Shono preview, hooray wall of text, boo to not being able to use quote tags in op)
Retribution Reaction : After the end of an Attack Phase in which you were the Defender: Declare an additional Attack Phase against that phase's Attacker, in which neither player can invite allies and you can only assign one unit. Give the Personality and each Follower in that unit +1F after it assigns.
Redeployment Reaction : After Cavalry Maneuvers, target one of your unbowed Scouts: Target a number of your unbowed Personalities less than or equal to your Scout's Chi. Assign them to a battelfield where there is an enemy army.
Determination Dark Virtue Reaction : Before you announce an action, target one of your Samurai: The action can not have its effects negated or have its targeting changed. After the action destroys any Personality, remove him from the game.
http://rules.l5r.com/Glossary_C#Cannot 1. When found in card text, and when referring to a type of cost or effect (e.g., bowing, Force bonuses), “cannot” (or "can not") means that a certain type of effect or cost is negated whenever it occurs. See also Negation. .. EXCEPTION: In card text, when referring to entering play, targeting, attaching, using a trait, or taking an action, "cannot" and "can only" are restrictions on the legality of that thing in the first place, not negation of its effects. [Targeting added, 21 November 2007] .. 2. When found in game rules text, the phrases “cannot” or “can only” apply to the legality of doing something in the first place; they do not imply that doing that thing is merely negated.
Alex Jones (rules official), 27 April 2008
The phrase "can only" only seems to appear within the Cannot entry. Since "Assigning" is not listed as an exception under section 1 of Cannot, and the "can only" restriction on Retribution is found in card text and not in game rules text, does this mean that a Determination reacted Redeployment will allow the Retributing player to assign more than one personality during a Retribution attack? (Inspired by the Shono preview, hooray wall of text, boo to not being able to use quote tags in op)
Retribution Reaction : After the end of an Attack Phase in which you were the Defender: Declare an additional Attack Phase against that phase's Attacker, in which neither player can invite allies and you can only assign one unit. Give the Personality and each Follower in that unit +1F after it assigns.
Redeployment Reaction : After Cavalry Maneuvers, target one of your unbowed Scouts: Target a number of your unbowed Personalities less than or equal to your Scout's Chi. Assign them to a battelfield where there is an enemy army.
Determination Dark Virtue Reaction : Before you announce an action, target one of your Samurai: The action can not have its effects negated or have its targeting changed. After the action destroys any Personality, remove him from the game.
http://rules.l5r.com/Glossary_C#Cannot 1. When found in card text, and when referring to a type of cost or effect (e.g., bowing, Force bonuses), “cannot” (or "can not") means that a certain type of effect or cost is negated whenever it occurs. See also Negation. .. EXCEPTION: In card text, when referring to entering play, targeting, attaching, using a trait, or taking an action, "cannot" and "can only" are restrictions on the legality of that thing in the first place, not negation of its effects. [Targeting added, 21 November 2007] .. 2. When found in game rules text, the phrases “cannot” or “can only” apply to the legality of doing something in the first place; they do not imply that doing that thing is merely negated.
"Can only" has been moved to the "Can" entry. With the new wording it should be clear that Retribution does not negate the assignment of additional units; Determination will have no effect on actions that assign additional units.