He was growing up. Filling out in all the right places. Now he was even taller than Katara herself. Easily about a foot taller. Teenage boys and their growth spurts, as unpredictable as the boys themselves. As he practiced with all of his bending skills, Katara drew her eyes away from him, staring purposefully at the scroll in her hands.
Each bending skill must be learned at a timely interval. None except the Avatar can restore the teachings, and rescue the earth from destruction at the hands of Aang really can hold his own. I wonder how well he holds up in other subject areas? No! Bad Katara, focus on scroll
Fortunately, the boy in question was having his own set of troubles, so he did not hone in on Kataras personal issues. He was trying to summon immense bursts of wind, while flying. It wasn’t as easy as some of those scrolls made it sound. And Katara was looking especially pretty. Talking to her now would only cause him further embarrassment, and he tried very hard to concentrate on his task.