Snape's involvement in the murder of Sirius

[pippin_999]

No: HPFGUIDX 169231

Jen:
> 
> To borrow from my post yesterday, this theory is an attempt to answer 
> a certain area of canon:  Snape said he passed information that 
> helped dispose of Black in front of the woman whom Dumbledore 
> credited with the passing of information that led to the same death.  
> Snape said this outside the awareness of the main POV character and 
> there was no explanation within HBP to reconcile the different 
> views.  To me that's fertile ground for theorizing a way to reconcile 
> the two pieces of information.
> 

Pippin:
But how would Narcissa make the connection? Kreacher passed
her information about *Harry*. She wouldn't know about Harry's
theory that Snape's taunting made Sirius go to the MoM, so why
should she connect Sirius's death with what Kreacher told her?

If Snape had claimed it was his information that got *Harry* to
the MoM, that would be a different story. But as neither Narcissa 
not Bella presumably knows anything about how Sirius happened
to turn up with the other Order members, they wouldn't be in 
a position to challenge Snape. 

As for Kreacher's information about Harry, that would not be
hard to get. First, Sirius is the only adult Harry writes to. Second,
Harry is, as we know, not very good at hiding his feelings. Harry has
no trouble recognizing looks of  devotion from House Elves, 
so they can't be very different from human ones. Kreacher
would only have to see them together.

It has always made sense to me that Snape was allowed to
tell Voldemort that Sirius was in London, hidden by the 
Secret Keeper spell. Otherwise, considering the fanatical
grudge which Wormtail would have reported Snape still
bore against Sirius, it would have been hard for Snape
to explain to Voldemort why he hadn't hunted down 
Sirius and killed him already.

Pippin