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No. Pettigrew cut his index finger off (supposedly with a knife) in such a way that prevented everyone but Sirius Black from seeing him doing so. It was then that Pettigrew blasted the street apart "with the wand behind his back" as Sirius says. In all the confusion and chaos, Pettigrew transformed into his Rat Animagus form and scurried down into the sewers leaving his single finger behind him as false evidence of his 'murder'.

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