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 November 2007
I have a question about Matsu Yoshino (Experienced 2) The card says Your attacking Lion Clan Personalities at Yoshino's location have a Force bonus equal to their Personal Honor. Tactical Battle: Destroy a target Personality with no attachments. You may then target and destroy an attachment.
Now take for example I attack with Matsu Yoshino (Experienced 2) and 2 other personalities with 3 personal honor. During the battle Matsu Yoshino is destroyed. Do my other 2 personalities keep their force bonuses or not?
With kind regards
Joeri755
Martin Lund (rules official), 26 November 2007
Additionally, if a continuous effect has a condition on it the effect begins at any point when the condition is met and the relevant cards are in play. Example: "Your Samurai have +1F while they are opposed." In this example, the effect on each Samurai begins when that Samurai becomes opposed.
Continuous effects from cards upon other cards normally end when one (or both) of the two cards leaves play or when the effect's condition is no longer met. In the example, the effect on each Samurai ends when that Samurai is no longer opposed.
Once Yoshino leaves play or leaves the Battlefield, no one there benefits from his Force Bonus anymore.