That same teenager got razzed mercilessly for a failure to grasp the basics of roleplay
as it applies to the GM. His thing about fog was really just a symptom of his failure to get the idea that I was trying to come up with
an inherently logical scenario, and while the idea of challenging the PCs was built into it, it was entirely possible to bypass any given element. He was convinced that "no matter what we do, he's gonna get us anyway, so it doesn't really matter."
He got a lesson in how flawed that premise was in the session where the mage (warrior mage, actually) face-planted into the tower. After the guy got back to camp and healed up a bit, the next morning they went looking for that tower. It was attached to a larger building, and the corner tower was the only part of it more than one story high. They found the structure and started investigating, and the bottom floor was a typical dwelling, abandoned. The only thing out of the ordinary was the door in the corner which led to the tower. It had some sort of drawing on it, which unbeknownst to him was a lightning bolt trap, set to go off when anyone besides the caster who emplaced it turned the doorknob.
The warrior mage was all for going out into the woods and finding some small animal, wrapping a rope or belt or some such around the doorknob, and twisting the knob just as the small animal was tossed in front of it. Did the rogue listen to
the guy who knew something about spells? No. Why not?
"If he wants to get us he's gonna get us, there's nothing we can do about it."
That may not be
precisely verbatim (it's been nearly 20 years ago after all), but it's pretty close. So since "it doesn't matter, he's gonna get us anyway", he went to the door, grabbed the knob and twisted.
He lived... but he was pretty badly injured. The downrange part of the bolt missed the warrior mage, who was standing in the entry doorway to the dwelling, by under a foot.
For months after that, the player of the warrior mage (his older brother) got endless mileage out of the phrase, "Grab the doorknob! Grab the doorknob!" Whether there
actually was a doorknob was beside the point entirely.
GM: "You see a cave."
Warrior Mage (to the rogue): "Grab the doorknob! Grab the doorknob!"