This has pretty broad applicability across a wide range of algorithms. The common failure mode when the machine fails to recognize the otherwise normal real face and body indicates that the whole face/skeleton relationship has fallen apart. Defeating this is interesting, as we have enough trouble just trying to recognize faces. To add to this "yes these are faces too but they are not faces too" is probably going to drive some researchers to drink. At the end of the day, this is a common flaw in a lot of deep learning systems, they're very brittle.