Redsand Canyon [BWP] stepping to the raging waters

He was making his return patrol, back eastwards at a quick pace.
The deep, grey and black sky blocked out the golden orange of the sun that usually baked the cayon wolves on the daily.
But not on this day.
No.

He sprinted, joyful of the breeze that accompanied the dullness.
Then the rain started, which slowed him a bit. The big blobs of water smacked him in the face, between his eyes and running into his ears, and soon enough he was drenched and his legs were clumped with wet sand and clay.
He made his way uphill, towards the pass. Hoping to wind through the passage before it got too deep.

He trotted through the walls of the canyon, letting the rising water wash the clumps from his legs. This may not be as good idea as he first thought, but he still needed to finish his patrol.

That was when he heard the gurgling.
Perhaps a new spring had been ignited.

Then the rushing echoes around him, making him stop dead.
No, it wasn't the sound of him splashing through the now knee deep water. How had it risen so quickly?!
He looked up to spot the water slosh around the corner, rising up the edge of the canyon wall with force, then the rest of the wave followed, pulsing and carring everything from further up the mountain towards him.
Fuck.

Derg turned, a yelp of panic and he tried to leap away through the water, unable to run, his heart pounding his eyes showing the whites of his eyes as the water engulfed him from behind and carried him of, pushing his head under and smothering him in clay and mud.

Derg awoke, caked in wet clay, deposited on the ground with the rest of the sediment around him.
The pass yearned before him. The flood had dissipated as it reached the open ground and was swallowed. From sky to ground.
 He lay there, panting and coughing for a bit.
Exhausted from his struggles.