You don't need to Succeed to spend the Opportunities. Success usually grants narrative bonuses like the GM telling you what action your opponent will take next.
Back with Yue, I won a duel with this. Rolled Theology, got some very good results, and thus was told that my opponent's fate lied elsewhere and not in fighting this duel. Next turn I made a successful Command (Reason) check to make him concede. It was neato.