>>20998855But the hook supports the theme of the line, which is worms vs wyrms.
It starts as a worm, a weak/useless bug that is consistently used as bait, and then it become a wyrm, a powerful dragon that is feared.
(plus both are known to live underground)
Additionally, the worm's horn from the "hook tip" becomes the horn in the wyrm which is based on the close up of a worm's head.