[HPforGrownups] Plot holes (Was: It's over, Snape is evil)

[Sherry Gomes]

No: HPFGUIDX 137628

KJ wrote:

3.   Personal sacrifice is another issue central to the books. Lily 
sacrificed her life for Harry. Dumbledore sacrificed his life by 
drinking a potion that he believed would kill him to destroy another 
horcrux. 


Sherry now:

I have heard this said many times by those who believe Snape is on the side
of good, and I would like clarification.  Do we actually *know* that the
potion would kill Dumbledore?  It weakened him, sickened him, but I don't
remember reading that it was definitely fatal.  If I just missed it, then
please refresh my memory.  Otherwise, is it just an assumption, that is
becoming fact in the minds of everyone.  Just as Snape's errand at the end
of GOF is assumed to be to return to spy on Voldemort, but is it ever
clearly stated to be so?

Sherry