What is Arthur referring to when he says "This is where it capsized"?

Question

In the movie Bone Tomahawk, Arthur has managed to get near the hillside cave of the "troglodytes" and says to himself something like, "This is where it capsized."

He may have been in a dry river bed, and maybe he sees the wreck of a boat, but his is not clear to me at all. So what does he mean? What is he referring to?

I found some discussion of this term on Reddit from 7 years ago and people seem to think this is a figure of speech, meaning essentially that this is where things went badly. I've never heard or read anyone use "capsized" in this way but it sounds plausible since apparently I am not the only one not to see a boat or river in that scene.

Answer 1

You are correct about it meaning, "This is where it all went bad". It's not a common phrase, but in context it's clearly meant to convey the same thing as "This is a bad idea", but in a more colorful way.