Zacharias watched the physical effects of the spell he could see, the way it glowed around his wrist as he felt the magic doing its job. He didn't know how Muggles survived without magic for certain things, and he knew he didn't want to find out first hand. He'd once considered going to a Muggle accident and emergency, but he didn't think it'd be worth it in the long run. There'd be too many questions from the Muggle medical staff, more than if he just went to St. Mungo's or asked Ernie for help. Although now Ernie seemed to be asking questions, and he wasn't sure he wanted to answer them.
"Naw, the other guy doesn't look worse," he said with a faint smile, keeping his eyes on the lavender light. "He mostly just grabbed my wrist after a stupid disagreement. I tried to pull one way. He pulled the other. His grip was stronger. I think our magic came into play. And.... Here I am," he said. "Nothing to worry about." He looked up at Ernie. As far as he knew, it wasn't anything to worry about it, and it was't anything he wanted Ernie -- or anyone else -- to worry about. It was just his father being disappointed in him again. Nothing new or worrisome there.