Perhaps Dumbledore and Snape changed places

[Dana]

No: HPFGUIDX 170977

anne:
> 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 ?

Dana:
The vow would not matter because DD would be Snape and visa versa. So 
we then have actually a dead Snape and a living DD. 

Dana