Sebastian just kept nodding his head politely. He obviously was not understanding a word that Billy was trying to explain. It was all very confusing. Magic often was. There was never an easy answer. Not that his story with the Caterpillars was much better. He looked down at his hands, and thought about what else he should say here. "My hands don't turn blue, but.." He flicked a finger tip and a pentagram came to life briefly. "I do make these when I cast. I'm not sure why. I think it helps me concentrate."