Hartley did notice that, no, they shouldn't be holding hands, but pulling away would probably be even worse. "It's not a toy, Giac." He let go of him to explain the components and what it did, at least in a way that he thought James could still follow. He wasn't stupid, he simply hadn't studied this the way he had, but Hartley had discussed such things with him for years now, so it really wasn't like he wouldn't get it. "It's just here for some calculations. We need to ensure the real thing can't malfunction."