I'm sorry if this is a bit superficial but he looked like the sort of kid that was picked on or would be picked on in school if it wasn't for the fact that he could kick anyone's ass!!
I was taking Tao Kwon-Do when I was 11. The only thing I remember from those years of lessons is.......getting kicked in the nuts by a girl the ONE day I forgot my cup. I couldn't fight back nor breathe. None the less, this seems really fast and accurate. If he keeps screaming like that though, he won't have to worry about 12 ninja attacking him in his suburban back yard. He'll have to worry about that blood vessel in his forehead that's about to burst.