The Marauder's Map & Pettigrew

[corinthum]

No: HPFGUIDX 45124

Arcum suggested:

> > Or perhaps the map only shows Maurauders to other Maurauders. 
> Lupin is the only one who saw Sirius or Peter on the map, after all. 
> It could have been a safeguard, in case the wrong people got ahold 
> of it while it was active...

And Marina countered:

> I'm afraid that won't work -- Snape saw Lupin on the map (PoA, US 
> paperback, pg 358).  That's how he knew to go to the Shrieking 
Shack.


Now me:

That doesn't completely rule out a safety mechanism.  Perhaps there is 
some addition spell needed in order to make the map show the 
marauders.  Snape didn't activate the map at all; Lupin did.  So it's 
possible Lupin performed this additional spell that night.  Why, of 
course, I wouldn't know.  Perhaps he was checking to make sure Sirius 
hadn't payed another unexpected visit, or maybe it was simply force of 
habit.

-Corinth