Snape didn't reply, just handed the parchment to the Headmaster. Meanwhile, the whole hall had gone silent when they realized something different was happening. That is why those who were close enough to the head table saw Dumbledore's eyes widen in surprise, and heard him murmur, "It's impossible! They've been gone for years." Then he raised his head and looked directly at Harry and the others. Turning solicitously to Professor Snape, he spoke quietly to him. No one could make out exactly what he said, but Snape didn't look happy as he nodded and left the table. Most of the students turned to watch Snape leave, but Harry was watching Dumbledore, and almost dropped his drink when the venerable Headmaster winked at him!