Rostam Drains the Great Cup

From C8.18, Rostam and Esfandiyar Drink Together. It illustrates C8.18.4–15 (to C8.18.16):

C8.18.4
When food was spread and Rostam took his seat,They watched amazed at how the chief could eat.
C8.18.5
Esfandiyar and all his heroes laidBefore him lambs in lavish spread displayed.
C8.18.6
He ate them all, while prince and people stared;The prince’s wonder all his people shared.
C8.18.7
The prince said, “Bring a cup; let raw wine pourIn place of cooked wine served to us before.
C8.18.8
Now see what Rostam seeks in wine today,And what of Kay Kavus he has to say.”
C8.18.9
The cupbearer brought wine; the cup was wideEnough to let a ship sail on its tide.
C8.18.10
He drank to the king of kings; that spring of redHe drained till dust rose from its empty bed.
C8.18.11
The young cupbearer turned again and boreThe royal wine, replenished as before.
C8.18.12
Then Rostam spoke to Bishutan aside:“Why must your water in this wine reside?
C8.18.13
Why pour in water, weakening the biteOf ancient wine and robbing it of might?”
C8.18.14
Then Bishutan gave orders: “Fill the bowlWith wine and let no water spoil the whole.”
C8.18.15
Wine came; they called the minstrels to the feast,And still their wonder at him had not ceased.