Harry Reflects on Snape's Betrayal and His Role in the Half-Blood Prince Book

PAGES: 637-638

As Harry reflects on the betrayal of Severus Snape, he dwells on how Dumbledore had trusted Snape, despite all the signs of his dark nature. Harry blames himself for not showing Dumbledore The Half-Blood Prince, which contained dangerous spells like Sectumsempra. He wrestles with the guilt of having used those spells, despite Snape's increasingly sinister behavior.