After the match, Harry follows Snape into the Forbidden Forest, where he overhears him threatening Quirrell about the Sorcerer’s Stone. This revelation confirms Harry’s suspicions about Snape’s intentions, prompting Harry, Ron, and Hermione to prepare for the threat.
And speaking of Snape…
A hooded figure came swiftly down the front steps of the castle. Clearly not wanting to be seen, it walked as fast as possible toward the forbidden forest. Harry’s victory faded from his mind as he watched. He recognized the figure’s prowling walk. Snape, sneaking into the forest while everyone else was at dinner—what was going on?
Harry jumped back on his Nimbus Two Thousand and took off. Gliding silently over the castle he saw Snape enter the forest at a run. He followed.
The trees were so thick he couldn’t see where Snape had gone. He flew in circles, lower and lower, brushing the top branches of trees until he heard voices. He glided toward them and landed noiselessly in a towering beech tree.
He climbed carefully along one of the branches, holding tight to his broomstick, trying to see through the leaves.
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Below, in a shadowy clearing, stood Snape, but he wasn’t alone. Quirrell was there, too. Harry couldn’t make out the look on his face, but he was stuttering worse than ever. Harry strained to catch what they were saying.
“…d-don’t know why you wanted t-t-to meet here of all p-places, Severus…”
“Oh, I thought we’d keep this private,” said Snape, his voice icy. “Students aren’t supposed to know about the Sorcerer’s Stone, after all.”
Harry leaned forward. Quirrell was mumbling something. Snape interrupted him.
“Have you found out how to get past that beast of Hagrid’s yet?”
“B-b-but Severus, I—”
“You don’t want me as your enemy, Quirrell,” said Snape, taking a step toward him.
“I—I don’t know what you—”
“You know perfectly well what I mean.”
An owl hooted loudly, and Harry nearly fell out of the tree. He steadied himself in time to hear Snape say, “—your little bit of hocus pocus. I’m waiting.”
“B-but I d-d-don’t—”
“Very well,” Snape cut in. “We’ll have another little chat soon, when you’ve had time to think things over and decided where your loyalties lie.”
He threw his cloak over his head and strode out of the clearing. It was almost dark now, but Harry could see Quirrell, standing quite still as though he was petrified.