Snape: the Riddle

[zgirnius]

No: HPFGUIDX 136024

eggplant wrote:
> It would be naïve, unless you were only vowing to do what you were
> already determined to do, to kill Dumbledore if Draco failed to do 
so. 

zgirnius:
OK. So you believe that Snape is evil, and he wants to get rid of DD 
and LV. (Do you favor a Snape wants to be the next Dark Lord theory? 
I tried to look up your older posts...)  Step 1 is to kill DD. Step 2 
is to wait for Harry to deal with LV/help Harry deal with LV. 

And the UV furthers this plan how?

A UV a priori limits one's freedom of action. In this specific case, 
Snape now has to look after Draco...how does this help him? Also, by 
taking this vow, he has limited himself as to when, under what 
circumstances, he must kill DD. As it happens, when Draco directly 
confronts DD he, through some clever planning (using the Vanishing 
Cabinets to import DEs) and blind luck (catching DD while the latter 
is 1) debilitated by the potion, and 2) with Harry), creates a lovely 
opportunity for Snape. But it did not have to be that way. Snape 
could just as easily have found himself in a position where Draco 
made an overt move and failed, forcing Snape to try and take on a 
healthy, armed DD. 

Hmmm...another thought, why Snape might agree to the UV (regardless 
of his underlying plans...)

Had Snape already been appointed to the DADA position at this time? 
Maybe this was also The Curse of DADA in action...