We were crossing a small wash ( Salt Wash) in the San Rafael Swell area of Utah. Four horses had crossed the wash, the 5th horse stepped on and his footing disappeared. The 1st four horses had pumped up the water, the sandy bottom had turned to jelly and wouldn't support the weight of the next horse. His front end dropped out of sight when he stepped onto the mud. His hind feet were still on solid ground. Of course the rider went over the head of the horse as the horse's front end dropped, and landed flat on his back in the little stream. Only about 1" deep water. The horse rolled out, but his nostrils, ears
And eyes were all full of sandy mud. This was a November Ride, so we had to warm up and dry out the rider.