In Harry Potter and also the Prisoner of Azkaban, why did the dementor assault Harry on the train? We recognize that they were trying to find Sirius Black, yet it cannot be an excusage for attacking Harry.

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The scene plays out in a different way in the book and also the film

Book

The dementor does not strike him personally. It stands close to him and also Harry is sindicate affected even more than his peers.

Standing in the doormeans, illuminated by the shivering flames in Lupin’s hand also, was a cloaked number that towered to the ceiling. Its challenge was totally hidden beneath its hood. Harry’s eyes darted downwards, and also what he experienced made his stomach contract. Tright here was a hand protruding from the cloak and also it was glistening, greyish, slimy-looking and scabbed, favor something dead that had decayed in water … It was visible just for a split second. As though the creature beneath the cloak sensed Harry’s gaze, the hand was suddenly withattracted into the folds of the black material. And then the point beneath the hood, whatever it was, attracted a long, slow, rattling breath, as though it was trying to suck somepoint more than air from its surroundings. An intense cold brushed up over them all. Harry felt his very own breath catch in his chest. The cold went deeper than his skin. It was inside his chest, it was inside his incredibly heart … Harry’s eyes rolled up right into his head. He couldn’t view. He was drowning in cold. Tright here was a rushing in his ears as though of water. He was being dragged downwards, the roaring thriving louder … And then, from far amethod, he heard screaming, terrible, terrified, pleading screams. He wanted to aid whoever it was, he tried to move his arms, yet couldn’t … a thick white fog was swirling about him, inside him – ‘Harry! Harry! Are you all right?’

Film

In the original screenplay the scene plays out in exceptionally much the exact same means, although through some extra visuals to present that Harry is being specifically impacted.

A HAND -- slimy and also scabbed -- a hand of death -- GRIPS the half-open compartment door, pushes it aside. REVEALS: a TOWERING, CLOAKED FIGURE, its confront hidden beneath its babsence hood. CROOKSHANKS" hair rises and also as she HISSES...

WHOOSHHHHH. The folds of the hood TREMBLE. A CHILL, RATTLING INTAKE OF AIR is heard. The FLAMES in Lupin"s hands SPUTTER. A SOUND SWELLS in Harry"s ears. Eerie. Painful. The sound of a WOMAN SCREAMING. Harry"s eyes roll up, eyelids fluttering.

And then... a SILVERY WHITE LIGHT drifts from his mouth. The world spins off its axis and Harry falls... glasses tumbling hard to the ground... then Harry... the muscles of his jaw twitching. THUNDER CRACKS. LIGHTNING paints the ICY home windows...

WHITE. BLACK. WHITE. BLACK...

With a DESPERATE GASP, Harry opens his eyes. Bweb links. DUSK IS GONE. The windows BLACK.

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Somewbelow between the creating of this version of the manuscript and also the filming, the decision was taken to incorporate the Dementor coming into the carriage and to encompass some footage of Lupin using the Patronus. Presumably this was done to create both the Dementors and also the Patronus charm to the audience.