Mrs. Markie is taking a whole-language approach to teaching reading. Whole-language approach for teaching languages emphasizes that children should focus on meaning and strategy instruction by trying to read complete sentences to understand the communication achieved trough the language. This method contrasts with phonics-based methods that emphasizes instruction for decoding and spelling.
The reason why the nine year old has an easy time of catching the ball while the three year old finds it difficult because the 9 year old has an increase reaction time in which he could respond easily to things that is being handed out to him, where as the three year old has a decrease reaction time, in which it makes it hard for him to cope up or respond to tasks that is being handed to him such as catching the ball.