For one thing, he plays a trombone that's bigger than he is. He could've played clarinet in band - even a trumpet - saxophone, those are cool - but no. It had to be trombone.
Playing an instrument like this is hazardous. Musicians are vulnerable to certain kinds of injuries, and this one was particularly painful. While putting his instrument together, his hand was literally pinched in the slide, necessitating a trip to Emergency. There was just one problem. . . his Taekwondo red belt test was in a couple of days. Obviously he'd have to cancel. This is a very big deal because the whole class takes the test together, and it's a rite of passage for them.
But let's not forget, this is Ryan, the Taekwondo Kid! Here he is ace-ing his test, a private test as it turned out, making it much more dramatic (and filmable - you usually can't pick them out of the herd). It has a sort of Karate Kid/Pat Morita/wax-on-wax-off vibe to it.
And here he is getting ready to play his trombone at the school Christmas concert.
Special bonus gif: Ryan singing in the choir.