He pushed the memories back. He had walked the entire snowy path that led from Hogsmeade. The castle stood dark and imposing above him, as he was about to cross the threshold. Being a Sunday morning, several groups of students had gathered in the courtyard to play in the snow. From afar, he saw someone who, after being challenged to walk on the icy banks of the Black Lake, advanced cautiously under the amused glances of his friends.