Snape's part in death of Sirius

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No: HPFGUIDX 107699

Hi,
  I read the last portions of Book5 yesterday and the actions of 
Snape looked to me as highly suspicious.
  According to Dumbledore, Snape first alerted the crowd at the 
Grimmauld Place that Harry might be thinking that Sirius was taken 
hostage by Voldemort at the ministry and then went to the Forest for 
searching Harry. Now this explanation raises several doubts.
 Firstly, why did Snape take so long to alert the Order? Assuming 
that the guys who appeared at the ministry for Harry's resuce started 
on the job immediately without dilly-dallying makes one ask, why were 
they so late? We do not know how they reached the ministry ofcourse, 
but I'm thinking they must either have used Floo powder or apparated 
or used a portkey. I don't think they used the Knight Bus or flown on 
brooms or thestrals. If so, why did they reach so  late after all the 
initial battle? Remember Harry and others flew with thestrals( though 
fast but not as much as Floo poder or apparating or portkeys), 
meaning they took a long time in coming to London. And then add all 
that time when they were searching for the prophecy and running from 
the Death Eaters. So why did the Order take so much time to come to 
their resuce if Snape alerted them on time? 
  Then there is this business of searching the forest. Surely he did 
not keep searching all the time along. He should have pretty much 
realised after a little search that Harrry might have really gone to 
the Ministry even though the Forest is large. Then why didn't he 
himself go to the ministry to rescue Harry?
  Snape's motives become more suspicious when Dumbledore says that 
Snape asked Sirius to stay at home to report to Dumbledore. Firstly 
these are all grownup wizards, don't tell me that they have to rely 
on a person staying back to report something. There must be so many 
wizarding methods to do that. Snape's taunt might be just that. He 
might have been taunting Sirius as the chance provided itself, 
knowing fully well that if Snape suggested anything like that Sirius 
will immediately disclaim any such thing and rush to the Ministry.
  This leads us to Snape's motives. I don't think he is on the wrong 
side, part of the conspiracy. But what I think is he wanted to Sirius 
out there in action; if not risking death, at least courting 
exposure. I think that he kind of played his part in motivating 
Sirius to go to the ministry and thereby put Sirius in danger. He may 
not have known for sure that Sirius might die but he was definitely 
counting on some kind of damage to Sirius. I think that's why he 
probably did not go to ministry himself. He was having his revenge 
and waiting for the result.
 And that is why I think harry feels such a rush of hatred towards 
him eventhough he does not know completely, he feels somrhow Snape 
played  a part in Sirius' death.

Bye
Adi