Nico had absolutely no frame of reference for He Who Shall Not Be Named. Outside of, apparently, being from some kind of book? Or maybe it was a comic? Or maybe some kind of mythology in Freddy's world akin to the Greeks and Romans and others in his? He wasn't exactly sure and made a note to try to find out later when he wouldn't feel so stupid for not knowing who that person was.
He glanced down at Freddy's arm a few seconds after the other boy, then grabbed his desk chair and pulled it over in front of the other boy. "Hold out your arm. I'm gonna try something," he said, sitting down in front of him. He'd only kind of tried this, and he knew he wasn't the best, but, well, he thought he ought to try. Worst thing that could happen was nothing.