What is the summary about chapter9 in lunch money

Mr. Z, the sixth-grade math teacher, likes to keep a peaceful classroom environment. He is unable to take control during the argument, however because he gets faint at the sight of blood. Maura takes Greg to the nurse’s office, where Greg tells the nurse his injury was an accident. When Maura leaves, he looks carefully at her book. He does not like the unicorn story, but he thinks her writing and drawings are good. He looks closer and realizes the drawings are original-it is no wonder she got so upset when he tore the book.