Insight + Sentei no Oni (exp) (L5R rules board)

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, 5 April 2008

Suppose I use Insight to look at the top 3 cards of my opponent's Fate deck, find a Ruthless Advance there and use it to kill my own defending Sentei no Oni (exp). Can I now use Sentei's Reaction as technically it was my opponent's card's effect that destroyed him? Thank you!

Insight: Dark Virtue Battle: Target one of your Samurai: Look at the top 3 cards of any Fate deck. If any are Action cards or Rings, you may play one of them for an additional Battle Action on it. You may rearrange the order of the remaining cards you looked at.

Sentei no Oni (exp): Reaction: Before Sentei is destroyed by another player's card effect during a battle, remove him from the game: Destroy all units in the current enemy army.

Ruthless Advance: Battle: Pay Gold equal to the target unit's total Gold Cost minus 2: Destroy a target defending unit.

[Mod edit: Formatting removed. Use sparingly! -ZF]

Zen Faulkes (rules official), 5 April 2008

Suppose I use Insight to look at the top 3 cards of my opponent's Fate deck, find a Ruthless Advance there and use it to kill my own defending Sentei no Oni (exp). Can I now use Sentei's Reaction as technically it was my opponent's card's effect that destroyed him?

Looks that way, yes.

On: Sentei no Oni, Insight, Ruthless Advance