Did Snape Try to Warn James at GH? (Re: Here is an interesting Snape one)

[potioncat]

No: HPFGUIDX 120582


 
> > Kneasy:
> > 
> > 1. Sirius is SK
> > 2. Snape gets information that the Potters are going to be 
attacked
> > 3. He  goes to SK Sirius, who takes him to the Potters
> > 4. Snape passes on the warning, Sirius rubbishes it, James sides 
> > with him
> > 5. Snape goes back to DD, tells him what happened 
> > 6. Meanwhile Sirius has second thoughts and for whatever the 
> > reason he persuades James to swop SK with all the consequences 
> > that entails
> > 7. *But both DD and SS believe Sirius is still SK*
> > 8. Death and destruction; everybody thinks Sirius is SK, Sirius 
to 
> > Azkaban, no questions asked.
> > 9. Guilt+++ from Sirius
> > 
> > Sound reasonable?
> 
> 
> SSSusan:
> My only concern is how we get from 3 to 4.  Why would Sirius [esp. 
> if he's already SK] take *Snape* TO the Potters?  Given their 
> history with Snape, I can't think of any reason other than because 
> he believe Snape is right that the Potters are targets.  But if 
> that's the case, then why does Sirius turn around and rubbish the 
> idea when Snape presents it to J/L?
> 
Potioncat:
I tried to read all the "Did Snape warn..." posts and I didn't see 
this point. I know I should have snipped, but I couldn't decide 
where. So here's the fly in the ointment.

According to PoA, in the Shrieking Shack, Black doesn't know Snape 
is a teacher at Hogwarts and according to GoF, Black never suspected 
Snape of working for LV. It appears that Black and Snape had no 
contact after graduating from Hogwarts. That would also mean that 
Black didn't know Snape suspected him of betraying the Potters. Nor 
did he know that Snape warned the Potters (or at least DD) about an 
attack.

But based on the comment Snape made in the Shrieking Shack, about 
James being too arrogant to believe Black would betray him, Snape 
had told either James or DD that Black had betrayed the Potters.

Now I'm getting confused.  But I'm sure of the first two paragraphs.
Potioncat