Can it be Impedimenta? Was: An AK Puzzle

[kempermentor]

No: HPFGUIDX 135162

Carol wrote:  
How, then, can anyone find out what really happened (if I'm right) and
deduce that Snape is still on Dumbledore's side, that he performed an
act of incredible courage and loyalty by doing what Dumbledore wanted
him to do? The abnormal AK is the only outward evidence and somehow
Harry must be made to see it. I can think of only three possibilities:
Dumbledore's portrait, Mad_Eye Moody (who will recognize the behavior
of an Impedimenta spell in place of an AK if Harry tells him the
story), or Snape himself at some point saving Harry and somehow having
the opportunity to tell him the truth.


Kemper has a forth possiblity:
Dumbledore has bottled a couple of his memories.  Harry discovers the 
memories among the other bottled memories and the pensieve the 
Dumbledore has bequethed to him.  Harry checks out the memory and 
learns the reason why Dumbledore trusts Snape and of their arguement in 
the forest.