Rostam Hurls the Uprooted Tree

From B5.9, Rostam’s Embassy to Mazandaran. It illustrates B5.9.4–7:

B5.9.4
The king sent chiefs in springtime robes to meetThe lion-envoy riding toward his seat.
B5.9.5
But Rostam marked a tree beside the track,Gripped two great branches, twisted both far back.
B5.9.6
He tore it root and all from earth below,And raised it like a reed before the foe.
B5.9.7
He hurled it forth; its branches, wide and vast,Struck down the riders as it thundered past.