thats interesting, ive always wondered about this.
i was in a taekwondo competition once, i really shouldnt have been, but i was. i was a noob and hadnt been doing it long but there was a lot of pressure in the clubs culture to go compete. because i was a noob with no clue, i totally smashed up my toes kicking the guy when all id ever kicked was those stupid floppy one handed kick pads. /
A similar thing happened to me in my first tourney. I broke my leg before the final when a guy from the dojo who hated me tried to take me out. Luckily my sensei knew this trick where he rubbed his hands together and transferred the heat to my leg which fixed it and I was able to win the final with a trick kick he taught me one day while we were at the beach.