In Harry Potter and also the prisoner of Azkaban, why walk the dementor strike Harry ~ above the train? We understand that castle were searching for Sirius Black, yet it can not be an excuse because that attacking Harry.

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The scene plays out in different ways in the book and the film

Book

The dementor doesn"t attack him personally. It stands close to him and also Harry is simply affected much more than his peers.

Standing in the doorway, illuminated by the shivering flames in Lupin’s hand, to be a cloaked figure that towered to the ceiling. Its confront was completely hidden beneath its hood. Harry’s eyes darted downwards, and what he saw made his stomach contract. There to be a hand protruding native the cloak and it was glistening, greyish, slimy-looking and scabbed, choose something dead that had decayed in water … It to be visible only for a split second. As though the biology beneath the coat sensed harry’s gaze, the hand was suddenly withdrawn right into the wrinkle of the black material. And then the point beneath the hood, whatever it was, drew a long, slow, rattling breath, as though it to be trying come suck something much more than air from its surroundings. An intense cold swept over castle all. Harry feeling his very own breath capture in his chest. The cold walk deeper 보다 his skin. It was within his chest, the was within his an extremely heart … Harry’s eyes rolled up right into his head. He couldn’t see. He to be drowning in cold. There to be a rushing in his ear as despite of water. He was being dragged downwards, the roaring growing louder … and then, from much away, the heard screaming, terrible, terrified, pleading screams. He wanted to aid whoever that was, that tried to relocate his arms, however couldn’t … a special white fog to be swirling roughly him, inside him – ‘Harry! Harry! are you every right?’

Film

In the initial screenplay the step plays out in really much the very same way, although through some extr visuals to show that take care of is being especially affected.

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

WHOOSHHHHH. The folds of the hood TREMBLE. A CHILL, RATTLING input OF air is heard. The FLAMES in Lupin"s hand SPUTTER. A SOUND SWELLS in Harry"s ears. Eerie. Painful. The sound the a woman SCREAMING. Harry"s eyes role up, eyelids fluttering.

And then... A SILVERY WHITE irradiate drifts native his mouth. The human being spins turn off its axis and Harry falls... Glasses tumbling difficult to the ground... Climate Harry... The muscle of his jaw twitching. THUNDER CRACKS. LIGHTNING paints the ICY windows...

WHITE. BLACK. WHITE. BLACK...

With a desperate GASP, Harry opens up his eyes. Blinks. DUSK IS GONE. The home windows BLACK.

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Somewhere in between the composing of this variation of the script and the filming, the decision to be taken to include the Dementor comes into the carriage and also to include some clip of Lupin utilizing the Patronus. May be this to be done to create both the Dementors and the Patronus charm come the audience.