Narrowing his eyes at the display, he nodded slowly to show that he understood what was happening. For indeed, he could see the magical forces at play, manipulated by Billy's concentration. Or lack thereof.
"Would that I have known this before," he commented, dropping his arms to his side as he walked closer. "Then I wouldst have catered to thy lessons, differently. Is there anything else that thou art able to do?
"And dost thou still possess the Rune Stones that I gave unto thee?"