In my previous thread, I lamented that Jin Yong never depicted Kiu Fung using the Dog Beating Stick Technique in DGSD. We know that Kiu Fung knew how to use this skill, but we never got to see him use it in the story.
What are your other most notable instances of wuxia characters being *known* to have practiced/mastered a certain martial art, but the audiences never get to see the character actually use that martial art?