He made his way down to the staffroom and knocked. There was no answer. He knocked again. Nothing.
Perhaps Snape had left the book in there? It was worth a try. He pushed the door ajar and peered inside -- and a horrible scene met his eyes.
Snape and Filch were inside, alone. Snape was holding his robes above his knees. One of his legs was bloody and mangled. Filch was handing Snape bandages.
"Blasted thing," Snape was saying. "How are you supposed to keep your eyes on all three heads at once?"
Harry tried to shut the door quietly, but ---
pg 182
"POTTER!"
Snape's face was twisted with fury as he dropped his robes quickly to hide his leg. Harry gulped.
"I just wondered if I could have my book back."
"GET OUT! OUT!"
Harry left, before Snape could take any more points from Gryffindor. He sprinted back upstairs.
"Did you get it?" Ron asked as Harry joined them. "What's the matter?"
In a low whisper, Harry told them what he"d seen.
"You know what this means?" he finished breathlessly. "He tried to get past that three-headed dog at Halloween! That's where he was going to when we saw him -- he's after whatever it's guarding! And I'd bet my broomstick he let that troll in, to make a diversion!"
snip
"Honestly, Hermione you think all teachers are saints or something," snapped Ron. "I'm with Harry. I wouldn't put anything past Snape. But what's he after. What's that dog guarding?"
snip
...but the expression on Snape's face when Harry had seen his leg wasn't easy to forget.
pg 183
"I found out something about him," he told Hagrid. "He tried to get past that three-headed dog on Halloween. It bit him. We think he was trying
to steal whatever it's guarding."
pg 192




