People forgetting as usual that the next logical step after MC kills foreign douche is foreign kingdom declaring war
Well, i doubt MC was thinking that far, tbf. And, just because the douche was left alive, doesn't mean enemy kingdom can't come up with a different justification (like "The cleric maiden was defending a gargoyle, surely this kingdom is conspiring with demons!" or something even less legitimate).
If MC did dispose of the douche (especially out there in the sticks) though, and it would've been foreign kingdom's business to prove shit - that foreign hero was there discreetly, acting pretty much as a saboteur.
Then again, there is a ton of
casus belli foreign kingdom can fabricate, just to declare a war. Like, if they really want to, they will pull out any kind of BS outta their asses for that, regardless of what really transpired.