How does Chris feel about "Instruction," and what is the example Walt goves?

From the text:

“Chris had so much natural talent,” Walt continues, “but if you tried to coach him, to polish his skill, to bring out that final ten percent, a wall went up. He resisted instruction of any kind. I’m a serious racquetball player, and I taught Chris to play when he was eleven. By the time he was fifteen or sixteen, he was beating me regularly. He was very, very quick and had a lot of power; but when I suggested he work on the gaps in his game, he refused to listen. Once in a tournament he came up against a forty-five-year-old man with a lot of experience. Chris won a bunch of points right out of the gate, but the guy was methodically testing him, probing for his weakness. As soon as he figured out which shot gave Chris the most trouble, that was the only shot Chris saw, and it was all over.”