I'd been wondering if Harry might have left Hermione's transfigured body with someone else. Probably not Neville or Quirrel, because the professors are already paying attention to them lately and Harry doesn't completely trust Quirrel's intentions. But he could safely leave it with Lesath, as long as no one saw Harry give Lesath the body and reclaim it later. Harry considers Lesath's loyalty a resource now, and no one else thinks Lesath is relevant. It's not typical of Harry to rely on others for help, though, so I'm not confident that he actually did this.