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If I were in the Hero's shoes, I would scold the girl, encourage her to be more tolerant and accept his feelings, persuade her to go back to that guy and give him what he asks for as an apology and reconciliation – after all, it wouldn't cost her anything. And then there would be no need to duel with her brother; everyone would be happy, and no one would suffer. And from there, we can move on. (probably that's why I'm not a priest)