Player One has two units in play: A Fusami and a second Unit (Unit #2) Player Two Ambushes Unit #2.
Player One attempts to use Fusami's Reaction. what happens ?
a) Fuasmi cannot move into the Ambush battle, her duel does not take place. b) Fusami cannot move into the Ambush battle, but her duel does still go off c) Something else that I am unaware of
Possibly relevant: Example #2 of the Blind Cards Rule (http://rules.l5r.com/Effects).
Text: Ambush Limited: Target one of your unbowed Personalities: Create a battlefield (not at any province). Assign your Personality to attack there. Assign another player’s target Personality to defend there, even if bowed. No other units may move there. Fight a battle there. After it ends, lose 5 Honor.
Fusami Reaction: After another player's target Personality assigns or moves to an army attacking you: Fusami moves to the target's location and challenges him. The challenge may be refused; if it is refused, bow the target and move him home. Destroy the loser.
Blind Cards Rule When a rule or card text needs to know what an action does or will do, it only takes into account the current text of the action. It does not consider any continuous, ongoing or triggered effects that change or negate the action's own function. Example 1: "Search your deck for an Action card with a challenge as one of its effects." Even if the condition "Challenges cannot be issued" is in effect, you may search your deck for such a card because of the blind cards rule. Example 2: Exceptions to the Rule of Location follow the blind cards rule, so that for example, it is still legal to take a Battle action that says it can move a target unit to the current battlefield, even if that movement is blocked by an ongoing negation effect. This rule should not be applied to retrospective knowledge of whether an action actually did something. Also note that under Timing rules, negation from ongoing and continuous effects precedes the chance to take a Reaction "before" something happens, and negation from ongoing effects precedes both triggered traits and Reactions. So, if an effect says "Units can not move from this battlefield," you still cannot take a Reaction "before moving" to an effect that normally moves a unit from the battlefield. The blind cards principle should not be over-applied beyond the specific case of needing to know what an action does; specifically, it should not interfere with the Good Faith rule of actions, which does take into account relevant knowledge about the game state.
Thanks Hitomi Drew