The Anvil Splits Beneath Goshtasb's Hammer

From C5.5, Goshtasb Arrives in Rum. It illustrates C5.5.52–61:

C5.5.52
Goshtasb sat long within the smithy’s glow,Until the craftsman wished that he would go.
C5.5.53
The smith said, “Good man, why sit waiting here?What do you seek? Explain and make it clear.”
C5.5.54
Goshtasb replied, “Good fortune on your skill!No hammer or hard work shall break my will.
C5.5.55
If you will keep me, I shall lend a hand;This hammer and this anvil I command.”
C5.5.56
When Burab heard the prince explain his aim,He took him as a helper at the flame.
C5.5.57
He heated up a heavy iron ball,Then brought it to the anvil in the stall.
C5.5.58
They gave Goshtasb a hammer, hard to bear;The smiths assembled round to watch and stare.
C5.5.59
He struck; the ball and anvil split in two;Throughout the market, talk and wonder grew.
C5.5.60
Burab grew frightened: “Young man, you are strong;No forge or anvil bears such blows for long,
C5.5.61
Nor hammer, iron, stone, or bellows will!”Goshtasb heard; his heart grew darker still.