"That is most disturbing" Optimus's holoform replied, "How is such a thing possible? Shouldn't there be some sign of struggle, or of their leaving?" It just didn't make sense. Although he had seen many strange things in the time he was alive, this was definitely one of the strangest. He didn't like it, it reeked of evil, of a threat. Of course, since he couldn't reveal his true form, he couldn't examine it more directly. If he did, he would fear that they would start to suspect something.