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, 7 June 2014
Iaijutsu Battle: Oneiyara challenges a target enemy Personality. After the duel, Fear equal to Oneiyara's Force that targets the loser.
After the first time each turn any of your Personalities wins a duel, give him a +1F token.
Does he get the token before or after the fear effect checks his force?
Brook Cunningham (rules official), 7 June 2014
Does he get the token before or after the fear effect checks his force?
He gets the token before he makes the fear.
The point at which a winner is determined in a duel (when the token is given) is before the entire duel ends (when the Fear effect is created).