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, 4 December 2007
My question involves the following two cards:
Strike of the Dragon Battle: Bow one of your Rings and one of your target Monks: Bow one to three target Personalities opposing him, each with Force higher than his own Chi.
Seat of Power Reaction: When an action would target one of your Unique Clan Champion or Daimyo Personalities: The action instead targets another of your legal Personalities with the same Clan alignment at his location.
If my opponent has two Personalities at the current battlefield, one of them being a Clan Champion, and I target both of them with Strike of the Dragon, can my opponent use Seat of Power to keep the Clan Chamption from being targetd?
Zen Faulkes (rules official), 5 December 2007
If my opponent has two Personalities at the current battlefield, one of them being a Clan Champion, and I target both of them with Strike of the Dragon, can my opponent use Seat of Power to keep the Clan Chamption from being targetd?
No, because the card does not get to change the number of targets, and there is no other Personality to be targeted "instead."
http://rules.l5r.com/Glossary_I-J#Instead: "In effects that substitute targeting, if the new target has to be a "legal" target, then failure to find a new legal target -- one that satisfies the requirements of the original targeting plus any additional requirements on targeting from other sources -- means the original targeting happens normally."