The Protection in Harry's Blood

[rockstar064]

No: HPFGUIDX 110574

I have been pondering something for awhile, and it's really irritating, 
because I can't ever find a good explanation.  I just don't understand 
why Harry's protection from the Avada Kedavra curse was lifted when his 
blood was used to resurrect Voldemort. In GOF, Voldemort said that he 
would now have the same protection that is in Harry's blood; however, 
in my mind, that doesn't mean Harry LOSES his protection. I've reread 
parts in the book over and over, and I still don't see it.  Wouldn't the 
curse still rebound off Harry even if it didn't do any harm to Voldemort? 
I would greatly appreciate it if someone could try to explain this to me.

Thanks
Michael