How have you used summoned horrors in your games (or seen others use them)? What can players/NPCs actually do about them?

The book says very little about running summoned horrors, mainly that they "are intensely powerful and highly resistant to harm". Saying "highly resistant" instead of "impervious" or "invulnerable" suggests that they can be "killed", but it would probably be an 8-clock or even a series of clocks (with the default effect potentially being "none"). Outside of combat, it seems like they would just be environmental hazards. Interesting, mobile environmental hazards, sure, but still just environmental hazards. I can't really see people negotiating with them. You run away from them, you try to work around them, or you try very hard to kill them. Is that all there is to them?