Hagrid Mentions Dumbledore's Argument with Snape

PAGES: 404-406

As Hagrid, Harry, and Hermione leave the hospital wing, Rubeus Hagrid inadvertently reveals that Dumbledore is angry with Severus Snape. Hagrid overheard an argument between the two, in which Snape complained about not wanting to fulfill a task he had agreed to do. Harry is immediately suspicious and presses Hagrid for more details.