Who is the adult (Was: Who's to blame for Occlumency?)

[potioncat]

No: HPFGUIDX 100678

Pippin wrote:
> 
> But if no one had tried to teach Harry Occlumency, he still would 
> have gone after Sirius, so I don't see that either Dumbledore or 
> Snape should be faulted for trying. 
> 

Potioncat:
And who could have guessed that Harry could actually get to the 
MoM?  Could anyone have imagined he would mount a flock of 
Threstrals?