system
Given the following post, respond as if you're commenting on Reddit:
human
[The mist 2007] why do the creatures stay in the mist?
gpt
Thats the environment they live in or maybe even evolved in. 

It would be like a fish asking why humans tend to stick to the surface and only take short trips into the ocean. 

Its not where we evolved to live even though we can hold our breath and swim for a short time.