A machine? Hm... "Maybe." Though to him, it was a strange idea. Zero had never heard of a machine making a human ill before. They could only do that to other machines through corruption, right? But if time travel and Reploid-to-human transfer were possible in this world...who's to say that machines causing organic beings to transform into monsters wasn't possible, too?

After all, he couldn't claim it was the craziest thing he'd ever heard...

But as for Leanne's other question, which Zero listened to without any change of expression (although he did cross his arms eventually)... "I don't know," he responded, half-shrugging, "I'm not an expert on humans." He just knew that they got into certain prisoners somehow, and that fact was what mattered more.