What turned Snape (Was: JKR site update SPOILERS)

[Tonks]

No: HPFGUIDX 159024

> Finwitch:
> 
> I recall him telling Harry it's magic at it's deepest when Harry 
said he didn't want any bond with Pettigrew. For another, why should
> Voldemort be unhappy of getting a servant 'in debt of Harry 
Potter', if the bond of life-debt has NO magical effects at all.
> 
> I suppose the effect could be like the Felix Felicis makes you 
lucky -- to benefit the one you owe your life to, despite your 
intention. Like er -- Pettigrew being involved with the Moody-
business -- Harry
> learned to resist Imperius.
> 
> Anyway, we ARE talking about wizards' bonds -- of course they're
> magical. Some ancient magic, I expect.

Tonks:
Here is what the Lexicon says:

"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 connection 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." (PA 

There does seem to be some type of magic involved that goes far 
beyond what wizards can do on their own. I wonder if this means that 
a wizard 'in debit' would not be able to kill the other one? Or as I 
have suggested before, as in Snape's case, if the saved wizard did 
something to cause the death of his savior, he would be damned in 
some way.

For the sake of this discussion, I too am a Snape loved Lily fan, 
but also the debit he had to James was also a factor, but not the 
biggest one.

Tonks+op