How and why does Peter manage to escape in Harry Potter and the Prisoner of Azkaban?
In Harry Potter and the Prisoner of Azkaban, Peter is able to escape because Lupin, who along with Ron had been guarding him after the group emerged from the Shrieking Shack, transforms into a werewolf, dropping his wand and enabling Peter to transform back into a rat. Normally, Lupin would be under the influence of the Wolfsbane Potion and would be harmless, but in the excitement of the night, he had forgotten to take it.
After Sirius and Lupin reveal Ron’s pet rat, Scabbers, to actually be a long-thought dead Animagus named Peter Pettigrew, Peter is able to procure a wand and turn back into a rat after the group has left the Shrieking Shack. Before that, however, Sirius and Lupin, who had just found out Peter was alive and had betrayed Harry's parents, are about to kill Peter, but Harry steps in front and saves Pettigrew’s life.
On the way out of the Shrieking Shack, Ron and Lupin together had been preventing Peter from...
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