Question #3

[Ceridwen]

No: HPFGUIDX 183410

kennyg1864:
> IIRC the prevailing guesswork is that DD knew of the breaking of the
> Fidelius Charm as soon as LV broke it (thanks to Wormtail's 
betrayal), since he had cast the Charm.

Ceridwen:
DD couldn't have cast the charm or he would have known that Peter was 
the SK, not Sirius.  He would have had to know who he was binding in 
the thing, or he could not have performed the spell.  If DD knew that 
Peter was the SK, then he has some tall explaining to do about why he 
allowed Sirius to languish in Azkaban all those years.  If Sirius had 
merely killed Peter, a traitor, the WW seems like the place that 
would still allow latitude for a "crime of passion" such as killing 
the person who betrayed a young couple to their deaths in service of 
a Dark Wizard.

We don't know how the Fidelius works.  We might have gotten an idea 
with the Unbreakable Vow, with two parties in agreement and a third 
binding that agreement, but we don't know that for certain.  If this 
is the case, there were more than three people involved in the 
Potter's Fidelius - the two adults to be protected (I assume that 
only adults or people over a certain age of accountability could 
enter into contractual agreements, even magical ones), the SK, and 
the one originally meant to be the SK.  Sirius could have cast the 
spell with Peter and the Potters all clasping hands.  DD wasn't 
necessary, and in my opinion, if he had been involved, then he acted 
criminally against Sirius.

Ceridwen.