Goshtasb Drives the Ball Out of Sight

From C5.13, Goshtasb’s Prowess before Caesar. It illustrates C5.13.15–21:

C5.13.15
He bade them saddle one earth-shaking steed,And rode where Caesar watched the riders’ speed.
C5.13.16
He watched the polo on the Caesar’s ground,Then asked for stick and ball from those around.
C5.13.17
He cast the ball among the mounted band,And gripped the polo stick within his hand.
C5.13.18
He spurred his horse; the others lost their pace,Their hands and feet grew helpless in the race.
C5.13.19
The warriors paused; no man could see it fly,So high he drove the ball into the sky.
C5.13.20
Where could the riders find the ball he played?They ceased their strokes; no further charge was made.
C5.13.21
The Roman faces paled; on every sideRose noise and clamor in a troubled tide.