To the man
Between the eyes it is then! Now tell me, how thick was the fog? Could you see inside of it? Were those creatures able to see you or know your location by any other means? Also, are there any trails left or is there anyone who can describe them?
To the rest of the party
Maybe I can trace them in the woods if I have something like an actual footprint or even a sketch of their feet so we can avoid a potential ambush.