The demon's sword looks like a broken piece of metal, but it's actually a powerful weapon. It used to be a god's weapon, but he's been dead for so long that even if he touched it, it would burn him alive. The only way to pull the sword out of the void is to touch it, but the demon doesn't have the strength to do that. He's afraid that if he touches the sword, the demon will kill him. The demon wants to take him away, so he tells the dog to grab the sword and pull it out. The dog can't get away from the demon, so the demon has to pull him out.