Answer to Question 1
At first, Ms. Roche tries to ignore Tina's misbehavior. But when the behavior escalates, she announces that Tina is having a bad day today, thereby drawing the class's attention to the misbehaving student and possibly creating a power struggle between the two of them. Finally, she sends Tina to the counseling office. The sequence of strategies does not seem to be effective, because Tina's behavior gets worse rather than better.
Answer to Question 2
He praises their performance on numerous occasions. Some of this praise is directed at individual students (e.g., Thanks, Gretchen, I think you've given Kathleen some good ideas about she might strengthen her story, Todd). Other praise is directed at the entire class