[HPforGrownups] Re: Who was responsible for Sirius' death? ...

[Bart Lidofsky]

No: HPFGUIDX 167654

From: Neri <nkafkafi at yahoo.com>
>So right now, blaming DDM!Snape for irresponsibility during the night
>of the MoM battle seems rather like abusing a corpse. He has so many
>worse things to explain first. Not to mention that at the moment
>DDM!Snape is somewhat hypothetical anyway. 
>
>If, however, Snape is *not* DDM, then it is almost certain that his
>actions during the night of the MoM operation will be revisited, and
>there will be some new revelations about it. If this will be the case
>then JKR had surely laid the groundwork for it in the end of OotP.

I have stated before that the fact that JKR never revealed the reason why Dumbledore trusted Snape so much means that either Snape is DDM, or JKR has played a nasty trick on her readership. I'd go for the latter. 

As far as the third part of the UV, there is one way it could have been done with Snape as DDM, and was STRONGLY hinted at in HPB: Dumbledore was terminal and on life support, with said life support almost certainly coming from Snape. So, if nothing else killed Dumbledore beforehand, when the time came, it would be Snape's job to "pull the plug." Therefore, the third part of the UV, like the first two, were things Snape was going to do anyway. 

If Snape had waited an additional half an hour or so, the OOPs would not have gotten to the MoM on time. And notice how, through written sleight of hand, Snape failed to give an answer about his part in the attack to Trixie (other than that he wasn't allowed to leave his post). Which means that it is still unknown to the Tommy and the DE's that Snape is the one who alerted the Order. Oops.

Bart