To start off, his hands would shake when he did a public speech. In the first passage it says that when he speaks, he would get nervous, when on the other hand, Katie isn't as nervous to play the game. He shows everyone how nervous he is because it shows that he is uncomfortable about public speeches. When the kids laugh, he gets more confidence each time. That helped him to keep on going.
To add on, Andrew's face would sweat when he did his presentation. However, Katie wasn't sweaty or nervous because in the second passage it