Though he is swift in the water, Kellon is accustomed to the open waters of the sea. His bulky shell bumps several times into river stones, slowing him or sending him off course. By the time he reaches the woman and begins to drag her away, the Mists are advancing past them. As Kellon pulls in a breath, he feels his mouth dried by its touch as if he'd swallowed a cloud of dust, bringing him to a coughing fit.

Pulling the elven woman out on the bank of the river, the Mists are right behind them now, looming far above like a wall as tall as the sky. The dark woods lie ahead. She is coughing and slowly coming back to her senses as she crawls up onto dry land and starts staggering away from the wall of fog. She tries to say something, but it is lost to another coughing fit as she grabs onto a tree for balance.

Spoiler: Mechanics
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Kellon and the elven woman have each suffered a level of Exhaustion; for her, another one.