How did Black get into Hogwarts in PoA? (Was: Dumbledore on the Dursleys . .

[richter_kuymal]

No: HPFGUIDX 151698

 Carol:   <snip> he could hide out in the
> Shrieking Shack (as we know he did and Lupin must have guessed 
that he  did), choose his time, and then just walk up to the doors 
in human  form (till Flitwick taught the doors to recognize him 
after the  *second* attack) and enter the school completely 
undetected and  undeterred? No one, not even Mrs. Norris, was 
watching the doors?
<snip> I've always blamed Lupin for not telling DD about the 
Marauder's Map  because I assumed that the secret passages were 
important, that Black must have used them to get in. But you seem to 
be saying that his only  important secret was that Black was an 
Animagus, and that was all DD  needed to know to protect the school 
against Black. (That and the fact  that he knew about the Shrieking 
Shack and was probably hiding out  there, as Lupin ought to have 
told DD and IIRC never did.) But being
> an Animagus explains only how he could get onto the grounds despite
> the Dementors. It doesn't explain how he could get into the school
> itself, unless, as you say, the doors were unguarded and unlocked,
> which makes no sense given the two attacks on Gryffindor tower, and
> makes the existence of the secret passages completely irrelevant
> (except as a way for *Harry* to get to Hogsmeade).
> 
PAR: Actually DD knew about the shrieking shack AND the passage as 
HE was the one who had it put in for Lupin when Lupin was a 
student.  And he had to know that Sirius was familiar with it as he 
knew about the Prank.  So Lupin really can't be held accountable for 
failing to notify DD about the possibility of Sirius using the shack 
(which does not show up on the map, after all) -- DD knew just as 
much about that shack as Lupin did.  



Carol: It makes no sense to me that Black could have  gotten into 
Hogwarts so easily, at any time, just by virtue of his  Animagus 
form. If that were the case, why did he wait two whole months
> (until the Halloween banquet) when he could have sneaked in any
> *night* of the year? And DD knew he was already on the grounds, or
> could easily get there again. Why, then, not put some sort of 
spell on
> the front doors or teach them to recognize Black after the *first*
> incident? Of course, both DD and Snape speak in later books about
> protective spells placed on the castle, but they play no role that 
I can see in PoA and they clearly didn't keep Sirius Black out of the
> castle.

PAR: it makes no sense to me that DD wouldn't know that Quirrel was 
possessed or that Fake!Moody was NOT Moody or any of a number of 
other issues.  Red Hen suggests that DD is simply unable to take 
action until the 11th hour.  The only other possibility is 
Puppetmaster!DD in which case he wanted Sirius to be able to gain 
access to Hogwarts for some reason.  

PAR.