Canon evidence for Snape being a vampire

[jklb66]

No: HPFGUIDX 35441

--- In HPforGrownups at y..., "pippin_999" <foxmoth at q...> wrote:
> GoF -35
> "Snape followed [Dumbledore], looking into the Foe-Glass 
> where his own face was still visible, staring into the room."
> 
> Snape enters the room behind Dumbledore, McGonagall goes 
> straight to Harry, but Dumbledore kicks the stunned 
> Crouch/Moody over onto his back. Snape is right behind him, 
> presumably as back up, but his attention is drawn to the 
> Foe-Glass, obviously not an ordinary mirror. Snape's fascinated 
> by it because ---he's never seen his reflection before?
> 
> Pippin
> who thinks that JKR is being very mysterious about vampires. If 
> not Snape, what is she hiding?

I was struck by the same thing-- he's far more interested in the foe-
glass than a person should be in that situation.  Why?  Has it been a 
long time since he saw himself?  

And as for the vampire essay that Lupin assigned his class: I've 
always wondered why Snape let Lupin take away the Maurader's Map 
after Snape has caught Harry with it.  He's already figured out that 
it may be directions into Hogsmeade:

"'A letter perhaps, written in invisible ink?  Or-- instructions to 
get into Hogsmeade without passing the dementors?'  Harry blinked.  
Snape's eyes gleamed."

When Snape calls in Lupin, Lupin does lie through his teeth and say 
it is just something from a joke shop.  But, do you REALLY think 
Snape believed him?

"Snape pointed at the parchment, on which the words of Messrs. Moony, 
Wormtail, Padfoot, and Prongs were still shining.  An odd closed 
expression appeared on Lupin's face.  'Well?' said Snape.  Lupin 
continued to stare at the map.  Harry had the impression that Lupin 
was doing some very quick thinking."

If Harry can spot the strange look on Lupin's face, so can Severus. 
I'm sure he believed Lupin was lying. So, why did Snape let Lupin 
pocket the map and walk out with it? Perhaps because of the very next 
thing Lupin said.

"He folded the map and tucked it inside his robes. 'Harry, Ron, come 
with me, I need a word about my vampire essay-- excuse us, Severus--'"

We'll never know how Snape reacted to that statement, because, "Harry 
didn't dare look back at Snape as they left his office."

Hmmm-- Severus, you get more interesting every day.