[HPforGrownups] Is Snape's Life Debt Paid?

[Bart Lidofsky]

No: HPFGUIDX 162972

From: pippin_999 <foxmoth at qnet.com>
>One of the disturbing things about the Unbreakable Vow is that
>it seems to come between Snape and his duty to Harry. How can
>he pledge his life to defend Draco when it's supposedly already
>pledged to defend Harry Potter. Isn't it a conflict of interest?

Bart: 
Either that, or there was no conflict of interest. Snape's attitude when he took the vow was that he wasn't promising to do anything that he wasn't going to do anyway (which is why Trixie's jaw kept bouncing off the floor). Maybe it was Occlumancy, or maybe it was because it fit neatly into Snape and Dumbledore's plans. 

Bart