Please define for me how this "real world" differs from full contact sparring.
In a training situation, to include full contact sparring, if your high kick gets grabbed and you wind up thrown to the ground, the opponent will more than likely stop things right there, for after all you're both dojo/kwoon/dojang mates. Also the instructor won't allow it to go beyond that.
In the UFC, after making yourself vulnerable by kicking high you might wind up thrown, grappled and submitted to a lock or choke. But the rules don't allow for more, and Big John McCarthy will be there to stop things from getting nasty.
In the real world, after making yourself vulnerable by kicking high you might wind up thrown, then your head or kidneys stomped or perhaps macerated with the odd brick lying about. Or maybe the guy's friends decide to play a game of soccer with your bod as the ball.
Is that definition enough?
Just when you think something is foolproof, they come out with a new and improved type of fool.