Voldemort's Intentions & Snape's Expectations

[willsonteam]

No: HPFGUIDX 189921

 
> Pippin:
snip. 
> 
> At this time Dumbledore wouldn't know that the people  Snape had palled around with at school were pre-Death Eaters, because they weren't exposed until after Voldemort's fall. 
> 

Potioncat:
I agree. Although I don't remember if we see the interaction between Snape and the Dumbledores, we do see how Albus treats DE!Snape on the windy hilltop. Certainly if he knew it was a DE eavesdropping, DD would have treated Snape as an enemy.

In literature a prophecy is often caused in part by someone's effort to prevent it from happening. Trelawney had spoken the prophecy which was heard in part by two people. The prophecy was in play. DD may have felt that to try to prevent it might only facilitate its progression. 

I don't think in that short moment between hearing Trelawney's words and becoming aware of Snape, that DD had any time to evaluate the prophecy--to have any opinion or theory of what LV might do or even who the prophecy might mean.