There was a long silence. 

"Maybe he'd better go to Madam Pomfrey," said Harry. "If he's seeing things like --" 

"What would your head have been doing in Hogsmeade, Potter?" said Snape softly. "Your head is not allowed in Hogsmeade. No part of your body has permission to be in Hogsmeade."

 "I know that," said Harry, striving to keep his face free of guilt or fear.  "It sounds like Malfoy's having hallucin --" 

"Malfoy is not having hallucinations," snarled Snape, and he bent down, a hand on each arm of Harry's chair, so that their faces were a foot apart. "If your head was in Hogsmeade, so was the rest of you." 

"I've been up in Gryffindor Tower," said Harry. "Like you told --""Can anyone confirm that?"

 Harry didn't say anything. Snape's thin mouth curled into a horrible smile. 

"So," he said, straightening up again. "Everyone from the Minister of Magic downward has been trying to keep famous Harry Potter safe from Sirius Black. But famous Harry Potter is a law unto himself Let the ordinary people worry about his safety! Famous Harry Potter goes where he wants to, with no thought for the consequences. 

Harry stayed silent. Snape was trying to provoke him into telling the truth. He wasn't going to do it. Snape had no proof -- yet.

 "How extraordinarily like your father you are, Potter," Snape said suddenly, his eyes glinting. "He too was exceedingly arrogant. A small amount of talent on the Quidditch field made him think he was a cut above the rest of us too. Strutting around the place with his friends and admirers... The resemblance between you is uncanny." 

"My dad didn't strut," said Harry, before he could stop himself. "And neither do I."