The Dragon Bites the Toothed Blade

From C5.12, Goshtasb Slays the Dragon. It illustrates C5.12.5–11:

C5.12.5
Goshtasb remained before the mountain lair,Where that fierce dragon poisoned all the air.
C5.12.6
The dragon saw him, drew a sucking breath,And pulled him toward its jaws, the gates of death.
C5.12.7
He slung his helmet from the saddle-bow,And shot a hail of arrows at his foe.
C5.12.8
The dragon closed upon him in the fray;The youthful warrior strove to break away.
C5.12.9
He thrust the toothed blade in its mouth and prayedTo God, the Giver of all good, for aid.
C5.12.10
The dragon bit the blade; its teeth pressed tight,And drove each edge into its mouth outright.
C5.12.11
Blood mixed with poison washed the mountainside;Its strength ebbed with the venom’s draining tide.