Answer to Question 1
She is first concerned about looking good and then later worried that she will look bad; in both instances, she has performance goals. Competitive tryouts are likely to induce performance goals in just about everyone, because being selected is the ultimate goal. Tryouts are usually not the time to develop new skills.
Answer to Question 2
Yes, it is developmentally appropriate. His students appear to be working in their zone of proximal development, as they can be successful when they have the assistance of their teacher and peers. In addition, the interactive nature of the lesson can help address the social needs that most adolescents have.