That's a stunning photo John.
This is sort of long but gotta tell it. A friend who lives in Gilbert Az, breaks her horses in the Superstitions. She ponies one along beside her horse, gets way into the mountains, drops her reins to ground-tie the one she is riding, JUMPS from his back onto the young one and of course, the youngster takes off running. She just lets him run until he realizes that he is no longer with the other horse and stops. Then she lets him find his way back to the other horse. She is also a tour guide there. She is also a lot braver than I am.