Describe the boy's horse ride.

If you're referring to Aram and Mourad's ride on the white horse, one way to describe the horse ride is that it is an exhilarating experience.
In fact, the boys enjoy the ride so much that Mourad sings during the ride. From the text, we learn that Mourad sings at the top of his lungs; Aram tells us that his cousin "roared" his happiness in song. Although Aram doesn't sing, he admits that the feel of the horse running is "wonderful."
After letting the horse run for as long as it wishes, Mourad takes the reins alone. He guides the horse across a field, crosses an irrigation ditch, and then returns to where Aram is waiting. When Aram gets on the horse for his solitary ride, however, he freezes in fear. After an irate prompting from Mourad, Aram kicks into the animal's muscles.
The horse takes off but doesn't perform as before. Instead of running toward the irrigation ditch (as it did with Mourad), the horse turns into a neighboring vineyard and begins jumping over vines. The text tells us that the horse jumps over seven vines before Aram falls off.
So, the horse ride was exhilarating for both boys. However, the boys also learned that it takes particular skill to guide a horse toward an intended destination.