Was Snape lurking in PoA or was he on his way to meet with Peter

[vmonte]

No: HPFGUIDX 120566


Fridwulfa wrote:
I'm sorry, but that's movie contamination. In the book Harry NEVER 
sees Peter's name on the map. Therefore he never goes looking for 
him in the middle of the night.
   
Alla responded:
The first part of Vmonte's post can be movie contamination, but can 
we be sure that Snape did not go to Shack to meet Peter? :)
Just to clarify -  I am also guilty of not reading the post 
carefully - somehow I assumed that rendezvous with Peter was to 
occur in the Shack and Harry caught him in the Shack.

vmonte now:
Oops! I just watched the PoA movie with my son. Fridwulfa is right, 
Harry never goes looking for Peter--it's movie contamination. I just 
reread the chapter titled: Snape's Grudge, from PoA. 

I do, however, find it curious that Snape calls Lupin to his office 
immediately after he finds (and is insulted by) the map. In Snape's 
worst memory (Snape's penseive memory) we can hear James and gang 
calling each other by their marauder names. Did Snape call Lupin into 
his office because he knew that Lupin was one of the creators of the 
map? 

page 288, U.S. edition paperback:

"Indeed?" said Snape.  His jaw had gone rigid with anger. "You think 
a joke shop could supply him with such a thing? You don't think it 
more likely that he got it directly from the manufacturers?"

Is he accusing Lupin of giving Harry the map? Is it possible that 
Snape knew about the marauders in high school? If he knew that Lupin 
was a werewolf, was he really almost killed by Sirius's prank? Or, 
did Snape have something else planned when he followed Sirius? And, 
did James foil his plan? 

We know the excuse Lupin gave for not telling Dumbledore that Sirius 
was an animagus. If Snape also knew about Sirius, what is his exuse 
for not telling Dumbledore?  

And, is this the real reason why Snape told Harry not to tell anyone 
about what he saw in the penseive?