Even as we watched them, a grayness fell on them, and then they grew dim.
Then the fog closed in on us, and swallowed us up, and drifted across the decks so thickly that we could barely see from gunwale to gunwale, damp, and chilling.

Still, the wind did not fail us, hurrying the fog before it.
"We must hold on until we know if this is but a bank of fog, or if it is everywhere," Bertric said.

"What say you, Malcolm ?" I thought a while, knowing the cold sea fogs of the north pretty well.
"Heidrek will be in it by this time," I said.

"Fog bank or more, I would about ship and run back past him with the wind.

If it is a bank, we shall go with it, and he must lose us.