Recently I've been studying kihon from different karate styles to try and round out my understanding. It seems like most styles include a flying side kick in their kihon. Does it ever show up in a kata? I know it doesn't in any Goju kata, but I don't know the Shuri-Te katas. I'd love to see it in context because the more I look at it the less convinced I am it's even a kick. It looks more like a jumping Uchi-Mata or harai-goshi to me.