Norman

“Pettigrew owes his life to you. You have sent Voldemort a deputy who is in your debt. When one wizard saves another wizard’s life, it creates a certain bond between them . . . and I’m much mistaken if Voldemort wants his servant in the debt of Harry Potter.” “I don’t want a bond with Pettigrew!” said Harry. “He betrayed my parents!” “This is magic at its deepest, its most impenetrable, Harry. But trust me . . . the time may come when you will be very glad you saved Pettigrew’s life.”
― J.K. Rowling, Harry Potter and the Prisoner of Azkaban