Keep close in by that big stone at the turn so they can't run you down, or stampede you.

If they head your way, scare them back." Satan quivered, and when I mounted, reared and plunged.

I had to hold him in hard, for he was eager to run.

At the cliff wall I was at some pains to check him.

He kept champing his bit and stamping his feet.
From my post I could see the mustangs flying before a cloud of dust.
Jones was turning in his horse behind a large rock in the middle of the canyon, where he evidently intended to hide.