Perhaps Dumbledore and Snape changed places

[anne]

No: HPFGUIDX 170975

Lady Potions:

I figured that Dumbledore was not the real Dumbledore when I was
reading the cave scene and then the fight scene takes place and
it turns out to be Snape who killed Dumbledore.

What if Snape and Dumbledore had exchanged what they looked like
with each other. Dumbledore always said, he trusts Snape with his
life. Perhaps it was Dumbledore who killed Snape.

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Would Snape's unbreakable vow give any problems in this scenario 
though?

Taking Polyjuice Potion to look like Dumbledore, while killing 
Dumbledore is so strongly connected with the vow, should it not 
have killed him straight away for breaking the vow ?

regards,

anne