The answer to the riddle -- whosawit?

[magistera_coi]

No: HPFGUIDX 129760

*snipped throughout*

TigerPatronus:
> US Pb PoA (p361): "Like father, like son, Potter! . . . You'd have 
> died like your father, too arrogant to believe you might be mistaken 
> in Black -- now get out of the way, or I will make you. . . ." -Snape

Valky:
> First lets draw the picture: James is adamant that Sirius would not
> betray him at the moment (or extremely close to the moment) of his death.
> 
> Voldemort kills James in a duel. 
> 
> Snape witnesses James unwavering trust in Sirius even when faced with
> imminent death and/or James actual death.


*delurks*
To me, the quote above seems like evidence Snape *wasn't* there, or at
least that James didn't say anything much if he were - because
presumably James knew who his Secret Keeper was, right? And it wasn't
Sirius. Snape, however, apparently believes that it was.

I can picture a fairly convoluted scenario wherein Snape/other
clueless DE says something like "Black has betrayed you" (not knowing
the real identity of the spy, and thinking that Sirius is the logical
choice) and James denying that he would, but well...Occam's Razor, and
that seems like an unlikely scene to posit. Easier (for me, anyway) to
believe that Snape just thinks that James was dumb to pick Sirius as
SK, aided by 13 years of hindsight and the fact that he hated them
both.

-Mags