Okay, say we've got a 5 player game going on here.
I am playing Stark, and this round I played the Plot card "I Fight to Win," and have Master of Whispers and Master of Coin.
My opponents have Hand of the King, Lord Commander of the Kingsguard, Crown Regent, and Master of Laws.
I have in play Arya Stark:
Response : After you win a challenge in which Arya Stark attacked alone, each opponent with a Title that opposes your Title must also satisfy the claim of that challenge, if able.
I also have Rickard Karstark:
Rickard Karstark does not kneel to attack during [Military] challenges.
If you are not running an agenda, Rickard Karstark gains: "
Response
: After 1 or more of an opponent's characters are killed for [Military] claim, Rickard Karstark claims 1 power."
Due to bad planning, or bad luck, the Lord Commander player has no military characters, and it's my turn for challenges.
I declare a military challenge against the Lord Commander player and kneel just Arya Stark as an attacker.
I win. Now, I activate Arya's response, forcing both the Master of Laws player and the Hand of the King player to also fulfill claim (but not the Crown Regent player because although I Oppose them, they do not Oppose me).
This gives me three separate triggers for Rickard's ability, and he claims three power.
Assuming I'm remember the Oppose and Support relationships correctly (as I'm doing this from memory), am I reading Rickard's ability correctly? It says "an opponent's characters," and they are each "an opponent" of mine, yes?