All Harry could think of doing was to keep Quirrell talking and stop him from concentrating on the mirror.
“I saw you and Snape in the forest—” he blurted out.
“Yes,” said Quirrell idly, walking around the mirror to look at the back. “He was on to me by that time, trying to find out how far I’d got. He suspected me all along. Tried to frighten me—as though he could, when I had Lord Voldemort on my side…”
Quirrell came back out from behind the mirror and stared hungrily into it.
“I see the Stone… I’m presenting it to my master… but where is it?”
Harry struggled against the ropes binding him, but they didn’t give. He had to keep Quirrell from giving his whole attention to the mirror.
“But Snape always seemed to hate me so much.”
“Oh, he does,” said Quirrell casually, “heavens, yes. He was at Hogwarts with your father, didn’t you know? They loathed each other. But he never wanted you dead.”
“But I heard you a few days ago, sobbing—I thought Snape was threatening you…”
For the first time, a spasm of fear flitted across Quirrell’s face.
“Sometimes,” he said, “I find it hard to follow my master’s instructions—he is a great wizard and I am weak—”
“You mean he was there in the classroom with you?” Harry gasped.
“He is with me wherever I go,” said Quirrell quietly. “I met him when I traveled around the world. A foolish young man I was then, full of ridiculous ideas about good and evil. Lord Voldemort showed me how wrong I was. There is no good and evil, there is only power, and those too weak to seek it… Since then, I have served him faithfully, although I have let him down many times. He has had to be very hard on me.” Quirrell shivered suddenly. “He does not forgive mistakes easily. When I failed to steal the stone from Gringotts, he was most displeased. He punished me… decided he would have to keep a closer watch on me…”
Quirrell’s voice trailed away. Harry was remembering his trip to Diagon Alley how could he have been so stupid? He’d seen Quirrell there that very day, shaken hands with him in the Leaky Cauldron.
Quirrell cursed under his breath.
“I don’t understand… is the Stone inside the mirror? Should I break it?”
Harry’s mind was racing.
What I want more than anything else in the world at the moment, he thought, is to find the Stone before Quirrell does. So if I look in the mirror, I should see myseff finding it—which means I’ll see where it’s hidden! But how can I look without Quirrell realizing what I’m up to?
He tried to edge to the left, to get in front of the glass without Quirrell noticing, but the ropes around his ankles were too tight: he tripped and fell over. Quirrell ignored him. He was still talking to himself.
“What does this mirror do? How does it work? Help me, Master!”