showing not telling in Betsy-Tacy and Tib

Thanks to osprey_archer , I've been (very leisurely) reading the first few Betsy-Tacy books. They are a real delight, and I laughed at this scene from the second, Betsy-Tacy and Tib. The girls are eight years old, and they're each looking after a younger sibling, and Betsy, the inventive one, has hit upon learning to fly as an activity. They will jump off progressively taller things, flapping their arms, until they master flight. At the point of this excerpt, they've already jumped off a hitchin...