That's actually much too small to be a sand worm of Dune. A baby one, to be sure. The sand worms of Arrakis can eat a harvester in one gulp. A harvester has a crew of almost 30. That thing's mouth isn't large enough for two men. Much less thirty and the giant machine they rode in on.
You know, I've wondered that too. How can something large enough to eat a Spice Harvester have its scales peeled back by a person with a hook? You'd think the scales would be much too heavy for them.
I agree. The worm would be too large to even care its scale was pulled back a few inches even if it was possible. I loved the book but the Fremen just cound not tame the adult makers.
Or maybe, there's something we're missing?
(Dun dun DUUN!)