system
Given the following post, respond as if you're commenting on Reddit:
human
[DUNE] If the Worms of Arrakis were territorial, why didn't the Fremen have to worry about attacks from other Worms while they rode on the back of another Worm?

It's been several years since my last read through of the series, but I remember the point that the Worms were often territorial and would attack other worms who wandered into their area.  So why wasn't there a constant fear of attack when riding a Worm?
gpt
You don't know that the fremen don't have to worry about worm attacks, you've just never seen it happen. Although it's also possible that worms avoid one another's territory to avoid trying to feed from ground already fed from, it may not require confrontation.