In connection with the Skylar Grey music video shown above , "Invisible", where the artist becomes a human fireball, some of the content of "Dance Without You" by the same artist is interesting as there seems to be some superficial connection between the two.
In "Dance Without You" it seems that demonic possession is a theme. A teenage girl dressed in a medical gown on a medical chair seems to be tormented by something and a hand appears to be trying to escape through her skin. Just after we see this hand impression Skylar Grey appears behind the girl suggesting that she herself is the possessing entity causing the phenomena.
Also the same teenage girl appears in "Invisible". Indeed in both videos the teenage girl appears first and is the focus of attention before Skylar Grey herself makes her own appearance.
But what does all this mean?