Draco had a tendency to withdraw into himself when he was uncomfortable or afraid. It was a personality trait she'd noticed years earlier when they were in their sixth year. He isolated himself while he tried to figure out how he was going to fulfill the impossible task of murdering Albus Dumbledore. Faced with an angry Hermione, he retreated inside himself again. Perhaps not to the same extent, but it was enough to prove that he had a bad habit of running away when life got difficult. Rising to his feet, he crossed the lounge and headed straight for his bedroom. The slamming of the bathroom door moments later seemed to indicate he was done talking.