Esfandiyar Vaults Onto the Black Steed

From C8.21, Rostam Battles Esfandiyar. It illustrates C8.21.24–31:

C8.21.24
He bade them saddle up his charger black,And bring it to him, harness on its back.
C8.21.25
He saw the sable horse; his strength and prideOf manhood stirred him at the horse’s side.
C8.21.26
He set his spear’s butt firmly on the ground,Then vaulted to the saddle with a bound.
C8.21.27
As when a leopard lands upon the backOf some wild ass that cries at the attack.
C8.21.28
The soldiers watched him, marveling at the sight,And blessed their famous champion’s strength and might.
C8.21.29
He rode, and saw upon his steed aloneGreat Rostam, with no comrade of his own.
C8.21.30
He called to Bishutan upon his steed,“To fight this man, no friend or mate I need.
C8.21.31
Since he stands there alone, I too shall go,And mount that lofty height before the foe.”