Jamie's excuses for not taking back the book are the reading of a book, taking a shower.
Jamie's real reason: He doesn't want to go past Rick Ward's house because his friends bully him.
Examples of the bullies' behavior: Calling him names and pushing him around.
When the bullying started: Since the beginning of the term.
Tom's offer: To go to them and sort them out.
Jamie's decision: To take the video back to the rental shop for Tom.