Harry rushed to Professor Lupin's office.
He knocked urgently.
"Who is it?" Professor Lupin said from behind the door.
Harry opened the door.
"Professor it's sirius black" Harry said. "He's at the shrieking shack."
Harry and Lupin rushed toward the passageway that led under the whomping willow.
They both went through it and saw a man with a mass of filthy, matted hair that hung to his elbows. He might have been a corpse. The waxy skin was stretched so tightly over the bones of his face, it looked like a skull.
"Wait that is an animagus Harry said pointing to the rat.
Yes, Harry it's pettigrew Black said.
"Set pettigrew down please" Harry said.
Black kindly obeyed.
Harry put him in a fully body bind and shot a blue light at him.
It was like watching a speeded-up film of a growing tree. A head was shooting upwards from the ground; limbs were sprouting; next moment, a man was standing where a rat had been, cringing and wringing his hands.
Pettigrew was a very short man, hardly taller than Harry. His thin, colourless hair was unkempt and there was a large bald patch on top. He had the shrunken appearance of a plump man who has lost a lot of weight in a short time. His skin looked grubby, almost like rat fur, and something of the rat lingered around his pointed nose and his very small, watery eyes.
Harry summoned a magical chain and collar. He put the collar on pettigrew.
Harry gave it to sirius.
"Come up let's bring fugly back up to the castle" Harry said.
Suddenly as they went outside Professor Lupin began to transform.
His hair began to fall out as his skin turned a matted sick grey. His jaw snapped and stretched and formed into a muzzle and his fingers and toes shrunk into paw like protrusi
Sirius dropped the chain and pettigrew turned into a left leaving.
"Damn it" Harry said.
Three swipes of the werewolf's claws left long and bloody cuts across Harry's chest and his shirt torn to shreds making him cry out in pain.
traveled up the veins in his neck, his face and then to his eyes. His turned red and had gained a silvery reflective like quality like moonlight. he started to change. First his screams of pain morphed into a echoing howl louder and more terrifying than Lupin could ever make. His skin all over his body started to turn from tan pink to black. His whole body started pulsing and bulging and with each pulse muscles started forming, sleek and defined and strong. Nothing like the sickly thin limps of professor Lupin. Short but thick black fur began to sprout all over his body as black as his skin as his muscled arms and legs began to grow. His fingers staying long slender digits but growing thick curved claws at the ends. His ankles turning into reversed second joints as his feet stretched and widened to allow him to balance on his bigger body. Harry could feel his shoulder blades changing and bat like wings came out of his back. Finally his mouth and jaw stretched into a black furred muzzle and the change was complete. Wind seemed to be whipping around the wolf Harry in a cyclone and the shadows around him were twisting and dancing.
Lupin roared at Harry, who roared back louder.
Lupin whimpered and bowed his head.
the shadows around him engulfed him for a moment and when they had cleared he had changed back to human.
Lupin galloped into the forest.
Harry saw them. Dementors at least a hundred of them, gliding in a black mass around the lake toward them.
Harry roared loudly.
"You'll bow down. . . .to your king Harry saidin the voice of Nihilus, You do not belong here. Go Home!
The dementors disappeared into the darkness.
"The Dementors are gone Harry said."
"See you around Harry" sirius said then he transformed running away.
Harry disappeared into the darkness reappearing in his room.
