I have recently noticed that in "Ten Duel Commandments" from Hamilton the pronoun used to describe the opponent is "they" like in
The challenge: demand satisfaction,
If they apologize, no need for further action.
It is odd to me because in the times where the action is placed it would be practically impossible for a woman to take part in a duel. Hence the question: what might have been the motivation to use this pronoun instead of "he"?
(I am nearly sure that it is not the matter of its sound in the song, as in "The World Was Wide Enough", which has the same music line, "he" is used instead.)