Rostam's Fist Fells Zhendeh Razm

From B8.15, Rostam Slays Zhendeh Razm. It illustrates B8.15.25–30:

B8.15.25
Then Zhendeh Razm rose on some affair,And left the feast while music filled the air.
B8.15.26
He saw a cypress-tall man in the shade,Whose equal nowhere in the ranks was made.
B8.15.27
He came to Rostam, challenging aloud:“Who are you, stranger, hidden from the crowd?
B8.15.28
Come to the light and let me see your face;No unknown man walks freely through this place.”
B8.15.29
Then Rostam struck one fist against his neck;The blow allowed no warning and no check.
B8.15.30
His soul departed at that single blow;He fell before he had a chance to know.