New Pottermore Stuff

[Jorlem]

Hazard wrote:

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Because the Secret Keeper getting killed might result in the Fidelius weakening or collapsing and Sirius would be both an obvious target and actively involved in the Order's battles?

With that in mind it makes sense to pick Pettigrew, he's on noone's radar, just some pathetic little wretch trying not to get killed.

If the Secret Keeper gets killed, then everyone who knows the Secret becomes a Secret Keeper.  If the Order knew that there was a spy, but not who it was, then, assuming the Order was told the Secret, the Keeper's death would have freed the spy to give the information to Voldemort.
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Stand between the Silver Crystal and the Golden Sea.
"Youngsters these days just have no appreciation for the magnificence of the legendary cucumber."  --Krityan Elder, Tales of Vesperia.