Are appearances important to Snape?

[hickengruendler]

No: HPFGUIDX 142232

 
> 
> a_svirn:
> 
> Not only that. Lupin also mentioned the Marauders' nicknames and we 
> know from the books 4-6, that Pettigrew is known among the DEs as 
> Wormtail. Even if Snape had only seen him hooded and masked before, 
> and had never guessed his true identity, after the Lupin's 
> explanations all the pieces must have fallen into place. 

Hickengruendler:

Yes, later he is known as Wormtail among the Death Eaters. But was he 
already in the first war? My main objection is, that I don't think 
Voldemort would tell too many people the name of his spy. Why should 
he do this and therefore risking that the spy would blow his cover? 
And Karkaroff told Crouch in GoF in the Pensieve scene, that many 
Death Eaters did not know every other DE's. I am aware that Sirius 
said that Wormtail hid himself, because many Death Eaters thought he 
betrayed Voldemort. But I don't think this automatically means, that 
all the DE's (including Snape) knew about Wormtail.
 
> a_svirn:
> How he was supposed to do deliver Sirius to the Dementors, if they 
> had been driven away by Harry's Patronus? 
> He couldn't very well 
> leave the unconscious kids at the lake and go in search for a 
> Dementor. Had there been a Dementer close in hand I have no doubt 
> whatsoever that he would have made good on his threat.
>

Hickengruendler:

The Dementors still had to be somewhere close. Harry didn't drive 
them away from the grounds. And they were meant to protect the 
Hogwarts grounds after all.