How does Snape know?

[potioncat]

No: HPFGUIDX 113576

Hannah, 
> As for Crouch!Moody not telling LV, I doubt they had a lot of 
> contact, they'd have had to be pretty careful, being right under 
> DD's nose.  When they got in touch, they probably discussed the 
> details of the plan and not much else.  I doubt Crouch considered 
it 
> even relevant to LV that Potter could resist the curse.
> 



Potioncat:
It may be one of those details which is not particularly important.  
But it jumped out at me.  IRRC, Snape says, "I'm told you're able to 
resist the Imperius."   He does seem to think it is important 
relative to learning Occlumency.  We just don't know how he found 
out.

To me the big issue, once again, is did DD either permit C!M to 
demonstrate the Unforgivables, or learn about it later, or never 
know? Because yes, DD would have reason to tell Snape about it.

And secondly, did a DE tell Snape, "Boy, when the Big Guy hit the 
kid with an Imperius, the kid shook it right off!"  Because LV 
doesn't seem to know that Harry can resist it.  And as far as I can 
tell, C!M did have ways of communicating with LV.  He sent an owl to 
LV to tell him Crouch Sr was dead.

Of course, it could be that Crouch JR had his own non-LV related 
reasons to perform these curses, and he wasn't too keen to let LV 
know about it.

Potioncat