Ewen really embodies the ideal of the 18th century gentlemen. Gentle and courteous to ladies and guests (and imprisoned officers count as guests), but ready and willing and indeed eager to fight in the right circumstances!

It's an interesting contrast to Keith, who is also an honorable gentleman, but hides it somewhat under a screen of irony and cynicism (although I don't think Keith is as cynical as he likes to think he is). Underneath they're alike, but they present differently on the outside and it makes them a bit of a puzzle to each other.