Question: Lupin said 'Your father and Sirius were the cleverest students in the school. Good thing too because an Animagus transformation can go horribly wrong' but how can the transformation go horribly wrong?
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Chosen answer: In the same way that the Polyjuice potion can go wrong. Magic when messed with can have disastrous consequences, as shown by Professor Lockhart who ends up in St Mungo's Hospital due to a backfiring charm. If performed incorrectly, an Animagus can splinch and get stuck halfway between a human and animal. When stuck like this, the accidental magic reversal squad will be required to deal with it.
Ssiscool ★