"Hm," Artemis said, sitting back in his chair to think. It didn't help his theory, which... honestly was little more than Badou Ken Yohji No Sound, Haku Schuldig Kakashi Yes Sound. What discerned each group from the other? It got louder when the magic fluctuated, which could mean that Schuldig didn't actually produce any sound, but just that Artemis had been upset at the time.

Elements, though... Haku seemed to be associated with snow, Kakashi with earth. But Schuldig? Schuldig (theoretically) just made everything louder, and Obi-Wan had a calm feeling to him. That wasn't exactly elemental.

"Are you sure that's all?" he asked, leaning forward a little. He hadn't heard or felt any water or lightning.