The Unbreakable Vow

[ceridwennight]

No: HPFGUIDX 138189

Kris:
> So, who enforces the vow?  Who is to say you have met up to the 
> terms?


Ceridwen:
JMO, the necklace and the mead weren't the final attempts.  Draco 
continued plotting the murder, as well as kept working to bring the DEs into Hogwarts.  He, too, may have started to let time interfere, making less effort.  Or he may have decided to scrap the plans he had and make better ones.

And, Snape's vow didn't seem to have a time limit, but maybe Draco's 
task did.  If I asked someone to make a UV to help someone who is 
tasked to complete a project by X date, then that person would be 
expected to provide the help by X date as well, even if it wasn't 
mentioned in the UV.  That would be known, as would the project.  
Neither are mentioned in the Spinner's End chapter, but we know at the end what the vow is meant to support.

Also, two things happened on the tower that would point to Draco not 
being able to complete his mission.  1) He begins to lower his wand.  2) He is seen as lowering his wand and not raising it, and a third party informs Snape that Draco doesn't seem to be able to fulfill his misssion.  It could be that the information given is the trigger all by itself.  But Snape takes a good look at what's happening and sees that Draco's wand is not in attack position.

And, since we don't know anything about the UV other than what we saw, and what Ron informs Harry of later on, the UV could take over and force the person under its onus, to do the deed at a set trigger.  It seems like a Dark Arts sort of vow, it may remove choice once it has been invoked.

Ceridwen