Harry and Wormtail's Bond
"Pettigrew owes his life to you. We 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.
"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."
- Dumbledore, UK edition of PoA, 'Owl Post Again', page 311.
Why did Voldemort take Wormtail back, if Wormtail is in Harry's debt? It's not like he couldn't have known; according to him, Voldemort knows everything (vain b******).
This is, most likely, going to be in the Final Battle, but what will it be?
Ideas, opinions, theories? Discuss.
NOTE: I did a search but couldn't find any threads about this, there was only a mention in a Wormtail thread, but I thought I'd make this for discussion only about the bond.