Responsiblity for Black's death

[kiel2fisch]

No: HPFGUIDX 81798

Salit:
> How could he (Sirius) have known in advance what Voldemort was 
> going to do or that Harry would never open the package?


Was there really need to know it in advance?

At the time when Harry used Umbridge's office to speak with Lupin 
and Sirius at Grimmauld Place, they knew already that using the 
Fireplaces was a great risk.

The very appropriate question for Sirius to ask would have been 
something like: "Harry, why don't you use my present instead of the 
fire?"  Then Harry would've known about the mirror and he could've 
checked Sirius' whereabouts later.

So it seems that it was rather his own forgetfulness, that killed 
Sirius, than Harrys.