OK, Prizm... that's not quite accurate. Clay's Volumetric fire, like all other material textures, does NOT emit light. Sorry. What you're seeing is reflection on the man's face... he must have a reflective material put on. The other drawback is that in order to have the fire material 'glow' without its own light source, the Ambient Color setting (in the Atmospheric settings) must be set to a reasonably bright color... the volumetric fire material has high Ambience values, but they can't produce any ambience that's not in the atmosphere. In Bryce, at least, the only objects which will emit light are the light primitives. The easy way to have an object (like a torch flame) emitting light is to place a radial light inside it... and then in the material for the torch flame (you can use Clay's fire, it's pretty darn good) select "disable Receive Shadows".