"Because Black's not worth dying for," said Ron. 

Harry looked at them. They didn't seem to understand at all. 

"D'you know what I see and hear every time a dementor gets too near me?" Ron and Hermione shook their heads, looking apprehensive. "I can hear my mum screaming and pleading with Voldemort. And if you'd heard your mum screaming like that, just about to be killed, you wouldn't forget it in a hurry. And if you found out someone who was supposed to be a friend of hers betrayed her and sent Voldemort after her --" 

"There's nothing you can do!" said Hermione, looking stricken. "The dementors will catch Black and he'll go back to Azkaban and -- and serve him right!" 

"You heard what Fudge said. Black isn't affected by Azkaban like normal people are. It's not a punishment for him like it is for the others." 

"So what are you saying?" said Ron, looking very tense. "You want to -- to kill Black or something?" 

"Don't be silly," said Herinione in a panicky voice. "Harry doesn't want to kill anyone, do you, Harry?" 

Again, Harry didn't answer. He didn't know what he wanted to do. All he knew was that the idea of doing nothing, while Black was at liberty, was almost more than he could stand. 

"Malfoy knows," he said abruptly. "Remember what he said to me in Potions? 'If it was me, I'd hunt him down myself... I'd want revenge."

"You're going to take Malfoy's advice instead of ours?" said Ron furiously. "Listen... you know what Pettigrew's mother got back after Black had finished with him? Dad told me -- the Order of Merlin, First Class, and Pettigrew's finger in a box. That was the biggest bit of him they could find. Black's a madman, Harry, and he's dangerous --" 

"Malfoy's dad must have told him," said Harry, ignoring Ron. "He was right in Voldemort's inner circle --"