Ernest unexpectedly had 3 extra days off school last week, when a norovirus spell swept through Hogwarts. It mainly struck the faculty. They were probably exposed to it just before the students returned from break. Ernest used his free time wisely: practicing levitation in the climbing cave, riding on his specialized nimbus 2011, and chatting through the fire (would that be the magical equivalent of skyping?) with his friend from Beauxbatons. Back to the grind of herbology, numerology, magical history and the like on Monday.