People are so addicted to the arbitrary “you did it!” mcguffins that they’ve started adding them to games that never had them. Now NES games aren’t done when the credits role because you failed to make it through stage 3 without taking damage or some other bull shit.
That last scene was amazing. He has no idea who she is and probably thinks it’s a bluff. When it’s too late he will probably come to the realization if who she is.