Casting styles change with the water. The same stroke that lays a dry line with perfect s-curves in a soft flat is useless in pocket water. As the river picks up speed, so must our casting. Effective drifts are shorter, so we cast more. Mixed surface currents greedily pull our built-in slack over to the next seam. So our casting matches the currents. It’s more aggressive. Faster.
But fishing rough or mixed currents doesn’t mean we give up on a good dead drift. And the best stroke for the job is one that I call the Crash Cast . . .