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“A heron, was it? Might’ve been. I thought it was a flying boggart. They do fly, some of ’em, making a kind of a whirring noise.

Out of the corner of his eye, he saw Professor Lupin forcing the boggart back into the packing case with his wand; it had turned into a silvery orb again.

“Another boggart,” said Lupin, stripping off his cloak.

“Why’s he got it in for Lupin? D’you think this is all because of the boggart?”

“I’ve been combing the castle ever since Tuesday, and very luckily, I found this one lurking inside Mr. Filch’s filing cabinet. It’s the nearest we’ll get to a real dementor. The boggart will turn into a dementor when he sees you, so we’ll be able to practice on him. I can store him in my office when we’re not using him; there’s a cupboard under my desk he’ll like.”