First, of course, he had to lick the door again but, before he did this, he listened. Everything was silent inside the room. He put the key into the lock and turned it as quietly as he could, but he still made some noise. Suddenly he stopped: someone was walking towards the door! He turned and ran along the corridor to his room, closed the door and locked it behind him as fast as he could. He waited and listened. "Perhaps this person can walk through doors and walls?" he whispered to himself. Nothing happened.