HBP post DH look Chapters 1-2.

[pippin_999]

No: HPFGUIDX 184283


> So I suppose I am not hundred percent sure if this conversation took 
> place when UV already happened or not, accordingly my question is did 
> he take the vow when he already knew that Dumbledore wants him to do 
> him in and accordingly he took the vow solely to protect Malfoy or 
> did he take the vow to find out the plan without being quite sure 
> what's going to happen next?
> 

Pippin: 

Snape says in Spinner's End that Dumbledore has "sustained a serious injury." 
Dumbledore's hand is damaged and he is wearing the ring with its cracked stone when he 
retrieves Harry, evidently that same night. Therefore, Snape had already  agreed that he 
would eventually kill Dumbledore. We can also see that Snape was telling Narcissa and 
Bella the truth when he said he knew of The Plan.

But Snape did not have any details on how The Plan was to be executed, and Dumbledore  
had made it Snape's "first priority" to find out what Draco was up to. Snape needed to gain 
Narcissa's trust. Also, she was frightened and dangerous, and who knows what harm she 
might have done to herself or to Draco if Snape had not been williing to help her?

Pippin