Shadow, what do you think the white on the shoulders is? It is the colour of the plane above, not the colour of the shoulders. So they picked a colour from another object. That would make it radiosity, as far as I understand that. And if you zoom in the browsers, you'll see a thin red line around the hair, which is not a JPEG artifact, as far as I can tell, because it's present on the render, too. BTW, whoever said that the colour bounces once, was wrong. (Or I remember incorrectly.) If you look at the underside of the arms, you can see the white colour of the light bounced off the ground. So the light goes Spotlight -> Plane -> Ground -> Arms. There's no reflection in the second pic, where I turned off the reflection on the skin. But TIR was turned off in the first one, and on in the second. BTW 2, the image has colour, too. :-) Take a close look at the body. BTW 3, what I like about this is that it gives proper shadows: further from the ground an object is, the lighter the shadow. Notice arms' and legs' shadows.

-- erlik