Sirius coughed. He looked at Remus as he spoke. "The Infe-- zombies, then. Could it be the other side of the ghosts?" The thought was unnerving, but he continued with it anyway. "I mean, it's far too late for Lily and James to suddenly be showing up, but I've heard they're not the only ones. So maybe some people had their souls come back, and some unlucky sods just had their bodies come back instead?"
He hoped all those bodies hadn't held trapped souls. That was too disturbing to think about.