Ancient Magic - sacrifice, blood-protection and such (very long)

[tapairuparauri]

No: HPFGUIDX 96762

> Lilian:
> In answer to Jetamors - Voldemort did not absorb Harry's blood 
> protection but the sacrifice protection. The latter comes from 
Lily's 
> sacrifice and remained in force until Voldemort had Harry's blood 
in 
> his veins - the pact of sacrifice (that's what I call it) now 
> recognizes him as the protected.

Jetamors:
All the sacrifice protection did for Harry was to rebound the AK, as 
far as I can tell.  The blood protection (which Harry gains from
living with the Dursleys) is what's been keeping him safe since
then.  I theorize that Voldie knows about the Sacrifice, but
*doesn't* know about the blood protection, at least as of the end of 
GoF.  

So when Voldemort uses Harry's blood, he thinks he's gaining the
sacrifice protection (which was actually a one shot deal) but he's
*actually* gaining the Dursley blood protection.  The blood
protection will consider him protected for a year (I'm assuming
it "reset" when the Dark Lord got it), but as of the one year
anniversary of the Third Task (sometime in June?) it lapsed, unless 
Voldemort spent the night at the Dursley's at some point.

~Jetamors, who is intrigued at the thought of Petunia getting the
old what-for and amused at the idea of Voldemort having a sleepover 
with Dudley.