The author's purpose of writing this paragraph is to refute the idea that children should have greater power than the teacher in the classroom, this is shown by giving ridiculous examples of the student ruling over the teacher.
__
The Author is is basically inferring that these propositions are nonsense and are examples to demean and refute other like ideas.
Summary
An hour later, Walter’s loss of the insurance money fills the apartment with “a sullen light of gloom.” Asagai enters the apartment to visit Beneatha, who is deeply upset about the lost money. Beneatha explains the situation to Asagai and he asks her how she is doing. Beneatha responds, “Me? . . . Me, I’m nothing.” She then recounts the story behind her initial desire to become a doctor, telling Asagai of a childhood friend who was severely injured in a sledding accident. Beneatha tells Asagai that she was amazed that “one person could . . . sew up the problem, make him all right again,” although she states that she has now lost her youthful idealism.
Hope this helps :)
This means that the story is being told in third person point of view!
Hope this helped!
~Just a girl in love with Shawn Mendes