Snape at Goodric's Hollow / Sirius - Peter SK switch

[potioncat]

No: HPFGUIDX 120488


>>Cindi H: 
I think James was killed right away as soon as VM arrived.  The 
voice heard  by Harry was Snape's telling Lily to take Harry and he 
would hold off VM.  This would still coincide with the priori 
incantatem that James came out of  VM's wand after Lily.

Potioncat:
I snipped too much, probably.

I think Snape believed up to OoP, that Black betrayed the Potters.  
And he either thought Lupin was in on the betrayal or he just 
doesn't trust werewolves.  His comment in the Shrieking Shack does 
indicate that Snape tried to warn James about Black.

I don't think Snape could have been the one defending Lily and Harry 
at GH because then LV would know Snape had switched sides and his 
comment at the graveyard would have been very different.