Rostam's Shout Saves Zavareh

From B7.3, Pilsam Battles the Iranians and Alkus’ Battle. It illustrates B7.3.64–71:

B7.3.64
Then Alkus swung his gorz with mountain might,And Zavareh’s strength deserted him outright.
B7.3.65
Zavareh fell senseless beneath the blow,And lay as one laid low by sudden woe.
B7.3.66
Alkus dismounted, hurrying to kill,To cut Zavareh’s head as he lay still.
B7.3.67
When Rostam saw his brother nearly dead,Like fire he rushed to where Zavareh bled.
B7.3.68
He shouted once; the plain itself seemed weak,And swords grew dull beneath that thunderous shriek.
B7.3.69
At Rostam’s voice, his terror showed within;His beating heart seemed visible through skin.
B7.3.70
Swift as the wind he mounted, seized by dread,His former courage from his spirit fled.
B7.3.71
Then Rostam cried: “You never knew till nowThe lion’s claws; that ignorance crowned your brow.”