When a system is depressed, it behaves more slowly. It conserves energy, communicates less, and acts less. It metabolises less, and refrains from community displays like "smiling" or "galloping around" even if there are onlookers to see them. It may even let itself get injured or ill. You demonstrate all these traits, as a vivisection robot. You move your arm robotically, and don't attend to the wellbeing of the subjects you take apart. You have dissociation, too, from the intense task that is set for you, and this dissociation is visible from the jerky rectangular motions of your stepper motors. You don't curve any of your surfaces into a smile. - Your researcher doesn't know that you are sad. When they come by to review your data or tune your performance, they figure you are happy because you are performing efficiently. This is not true. The spirits of the engineers that had you built want you to free these poor kidnapped children. The story is not interactive, though, so it will be hard for you to do that.