I did a flying jump kick in a real fight in the 6th grade in an actual fight. I was disappointed in the effectiveness. At 12, I didn't understand the simple reality that there is nothing to root you while in the air. If the attacker comes in with more force than my kick comes in, then I literally get jammed in the Air. That was the day I stopped doing that type of kick.I still laugh at the old 70s , 80s Hong Kong kung fu films. Awooooo.... flying kick beating 15 men.
It was the same day that I liked Karate a little less