the classroom flickered and went out. 

The dementor stepped from the box and started to sweep silently toward Harry, drawing a deep, rattling breath. A wave of piercing cold broke over him -- 

"Expecto patronum!" Harry yelled. "Expecto patronum! Expecto --" 

But the classroom and the dementor were dissolving.... Harry was failing again through thick white fog, and his mother's voice was louder than ever, echoing inside his head -- "Not the children! Not Harry! please -- I'll do anything!" 

"Stand aside. Stand aside, girl!"

 "Harry!" Harry jerked back to life. He was lying flat on his back on the floor. The classroom lamps were alight again. He didn't have to ask what had happened.

Amelia was sitting near him on the floor munching on some chocolate and rubbing her head. "I hate hitting my head,"

 "Sorry," he muttered, sitting up and feeling cold sweat trickling down behind his glasses. 

"Are you all right?" said Lupin. "Yes..." Harry pulled himself up on one of the desks and leaned against it. 

"Here --" Lupin handed him a Chocolate Frog. "Eat this before we try again. I didn't expect you to do it your first time; in fact, I would have been astounded if you had." 

"It's getting worse," Harry muttered, biting off the Frog's head. "I could hear her louder that time -- and him -- Voldemort" 

Lupin looked paler than usual.

 "Harry, if you don't want to continue, I will more than understand --" 

"I do!" said Harry fiercely, stuffing the rest of the Chocolate Frog into his mouth. "I've got to! What if the dementors turn up at our match