Pensieve = Security Camera?

[smartone564]

No: HPFGUIDX 105006

Carol wrote:

> As for Snape studying his own memories, that's a distinct possibility,
> but he was clearly using the Pensieve for a different purpose (hiding
> his memories from Harry and thus from Voldemort) during the Occlumency
> lessons. A Pensieve (his own or Dumbledore's) would certainly come in
> handy for spy!Snape as a way of concealing thoughts and memories from
> Voldemort if he ever has to confront him directly rather than
> indirectly through Lucius Malfoy.

If the pensieve allows you to get all information, visual/ auditory/ 
etc. in some radius around the person's who 
memory it is, couldn't teachers use this as a powerful weapon in 
class? They could wander around and see what their students 
were actually doing.

I thought that up from an earlier thread, but it got rejected due to 
not following posting rules.  However, couldn't a spy put his 
thoughts into a pensieve and gain information, as Carol said?  
Also, couldn't Harry put his memory of the GY and hear what was 
said by LV to the out-of-earshot DEs?  Though I think this might 
be a little unfair to JKR, this is a rather cheap way of gaining 
information.

Another thing, when DD recalled the prophecy, Trelawney came 
out and formed, instead of going in.  Why is this? Can DD just 
control it, since he used his wand to find it, as opposed to when 
Harry touched it?  Or was this just to leave out all the details 
required to re-invent the prophecy scene (a.k.a. writer's license)?

Smart