JKR Interview on Mugglenet; Snape = Evil?

[oaksong]

No: HPFGUIDX 133995

[snip]
> 
> I choose to look at Snape's guilt or innocent based upon his entire 
> HP history not only on fragments in the latest book. I want to keep 
> an open mind as to what Rowling's verdict will be, rather than put 
> all my eggs into my basket. As the H-Hr shippers have found, doing 
> that only resulted in alot of broken eggs.
> 
> Milz

The Unbreakable Vow...

The issue of the state of the vow hinges on what would happen if Snape
fails to kill DD.

If failing to kill DD would result in the death of Draco, then DD is
automatically dead, regardless of whether or not Snape wants to do this.

There is also a strong suggestion that Snape is under the same kind of
obediance requirement that Harry is under, from DD. DD has ordered
Snape to kill him if the situation calls for it and DD clearly
considers himself expendable in the effort to remove Voldemort.

Is there a possibility that Snape is also under an Unbreakable Vow to
protect Harry?

Oaksong.