I think it feels personal because he respects Keith and can tell that he's an honourable and admirable man, even if there are no stronger feelings yet! With someone he didn't respect much, he would still care for the sake of his own honour, but it wouldn't be as intense in front of Keith.
We see plenty of dishonourable Hanoverian officers later, so really, Ewen was lucky to capture Keith and not someone else.
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We see plenty of dishonourable Hanoverian officers later, so really, Ewen was lucky to capture Keith and not someone else.