Innocent question (spoiler alert!)

[Phyllis]

There was a gleam? There was a gleam? There was a gleam? There was a 
gleam? There was a gleam? There was a gleam? There was a gleam?

David:
 
<<I was looking again at GOF, and noticed that as Harry relates the 
adventure in the graveyard to Dumbledore, and mentions that a sample 
of his blood was required for the rebirthing potion, there is a 
momentary gleam of triumph in Dumbledore's eye.

Is there anything in HBP that casts light on what that is about?>>


Perhaps the gleam of triumph had to do with Dumbledore realizing that 
Voldemort had not yet worked out that Dumbledore had figured out the 
existence of the horcruxes.  Voldemort seems to think that using 
Harry's blood has made him immune to attack.  Dumbledore knows this 
isn't true - he knows that if the horcruxes can all be destroyed, 
Voldemort will be mortal again, regardless of whether Lily's blood 
resides in his veins.

~Phyllis
Who needs to give the credit for the "There was a gleam?" spoiler space 
message to Lexicon Steve