With a small shake of his head, Nico reached out toward Freddy's arm. He kept his hand above the other boy's arm as he focused, drawing the shadows and darkness from nearby. He didn't know how well it'd work on Freddy, how it worked on anyone who wasn't a demigod, really, but he focused on using the shadows and darkness to heal Freddy's arm. He wasn't a child of Apollo, but he had his own talents. Most weren't as therapeutic as healing, true. However, he knew he could handle bruises and scrapes and scratches. Anything more than that, well, he figured Freddy wouldn't be here right now but down with someone far more skilled in medicine than he was.
After a few moments, Nico dropped his hand into his lap, examining his work as the shadows retreated to their normal corners of the room.