Casey glanced over his shoulder as he ran and saw dimly that the burros had turned and were coming after him, their ears flapping loosely on their bobbing heads as they trotted.

Beyond him, the light still traveled towards the Tippipahs.
Then, with an abruptness that cannot be pictured, everything was blotted out in a great, blinding swirl of dust as the wind came whooping down upon them.

It threw Casey as though some one had tripped him.

It spun him round and round on his back like an overturned beetle, and then scooted him across the lake's surface flat as a floor.

He thought of the Crevice, but there was nothing he could do save hold his head off the ground and his two palms over his face, shielding his nostrils a little from the smother of dust.
Sometimes he was lifted inches from the surface and borne with incredible swiftness.