Kavus Refuses the Nush-Daru

From B8.22, Rostam Seeks the Elixir. It illustrates B8.22.8–19 (to B8.22.22):

B8.22.8
Then Gudarz sped like wind to bear the word,And told to Kavus all that he had heard.
B8.22.9
The Shah replied: “Who stands in higher placeThan Rostam, who has never known disgrace?
B8.22.10
No harm to Rostam would I ever choose;His honor in my sight I will not lose.
B8.22.11
But if I send the healing draft I own,That elephant-bodied youth would rise full-grown.
B8.22.12
He then would rise, his father’s strength to crown;Together they would strike my fortunes down.
B8.22.13
If harm should come from one I chose to mend,I would repay the wrong from end to end.
B8.22.14
You heard him cry, ‘Who is Kavus to me?If he is Shah, then what can Tus still be?’
B8.22.15
Where could a man so vast find room at all,With such great shoulders, farr, and stature tall?
B8.22.16
How could he bow before my sovereign claim,Or curb such farr beneath another’s name?
B8.22.17
He counted insults out before my men,And stripped my honor from me there and then.
B8.22.18
If such a son should live beside his sire,I would be dust within their hands entire.
B8.22.19
Have you not heard what Sohrab dared proclaim?You know the world and should recall his claim: