Snape's involvement in the murder of Sirius

[Zara]

No: HPFGUIDX 169087

 
> Jen:  
> Sirius does conjecture Peter blew his animagus disguise and 
> that's the information we get about it.  As for Peter knowing about 
> the offer of a home, I've re-read that section in POA and can't 
tell 
> that Peter would have heard or listened to Harry and Sirius. 

zgirnius:
He could have. I think he would have. He was facing the prospect of 
life in Azkaban, I think he would be grabbing for any possible idea 
of ways to talk Harry around, which means paying attention to Harry.

He also saw Harry attack Snape in defense of Sirius. There's just too 
much there, in my opinion.

> Jen:
>  Anyway, Peter wouldn't know more intimate information 
> about the progression of the relationship between Sirius and Harry, 
> where Sirius regards him as a mix between a son and a brother and 
> Sirius is the one Harry would go to any lengths to save.  That's 
> got to come from someone later on.

zgirnius:
Neither would Snape know any intimate information about the 
progression of their relationship! Unless Dumbledore did confide in 
Snape about Sirius, which you are supposing he would not, Snape would 
not be aware that Harry was corresponding with him in GoF, and that 
Sirius lived in the vicinity of Hogsmeade for a time and was visited 
by Harry. 

Neither would Snape be aware of the relationship as it developed 
during Harry's time at 12 GP. Snape showed up only for Order meetings 
and did not socialize at all. Nor did he and Harry ever discuss 
Sirius. Snape could *speculate*, naturally. So could Peter, for that 
matter. Or Narcissa, with the aid of Kreacher. Or Kreacher might just 
be able to tell.

I find bizarre the idea that Snape might believe that Sirius was the 
traitor, and yet believe that Dumbledore still trusted him at the end 
of GoF. Actually, I also find it bizarre that Snape would credit 
Harry with a powerful attachment to the man who betrayed his parents. 
It is not a simple matter of Marauders vs. Snape, after all. There is 
the small matter of James, himself a Marauder, and clearly someone 
Snape would regard as a favorite of Dumbledore's (that Head 
Boyship...). Even if Snape had the bare minimum of information about 
Peter - that he was a servant of Voldemort in the first war and was 
returning to his master and helping to restore him in GoF, that's the 
point at which I figure Snape would put two and two together: That 
the reason Harry and Dumbledore trust Sirius is that they think 
Sirius is innocent. And since Peter is alive, AND a Death Eater, this 
just might be because they know *he* was the traitor.