Harry couldn't help but rush to Nell, crouching down and taking the boy by the arms, looking him over carefully. He didn't much care if his movements separated Nell from Demetri- Demetri had no right to touch the frightened boy anyway, he would only make it worse. "You need to sit down for a little while." He said softly, before standing up straight and brushing the boy's hair from his eyes. "I shouldn't have let you wander off by yourself." He muttered, before looking to Demetri. "Thank you for looking after Nell. I'll manage from here." He said, tone less thankful then it aught.