Not sure. Someone else will have to answer that. I'm still mystified as to how to do alot of things in Poser, hehe. I've been using it for over 18 months, but it's only been in the last 4 months or so that I've started to do more than play "dress up dolly" in it. Because it's a reflection, my guess would be that you have a reflection node and used raytracing... or something like that, and the mist is acting like a floor or a mirror, but that's just a blind guess on my part. I'll keep my eyes on this thread so I find out too :)

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi