Velocity FOG?

[Æliath]

I have an urgent request to make.
I use a set of mapping in the following way:
- Panorama
- tileset
- FOG

But I want to do something that I have not seen yet...
When I press the Z button, my character runs...
When he runs, however, the FOG is glued to the screen, and I would like to move as soon as I press Z to run my character.
You can do such a thing?
I would not know how to fix this thing...
Thanks to those who answer me ^^