What turned Snape (Was: JKR site update SPOILERS)

[hickengruendler]

No: HPFGUIDX 158918

  
> Neri:
> Are you saying you don't think Snape owed a life debt to James at all?
> Or that he did, but that this wasn't the reason he "turned"?
> 

Hickengruendler:

The later. I think if the Life Debt was the reason, why Snape turned, 
there would be no reason to make a secret out of it. I think Dumbledore 
would have told Harry and JKR would have told us.