I went back Saturday.
When I pass that one spot, I could here a tree creaking in the wind. The hairs on my neck stood up again, and the electric sensation went up my spine. Maybe it's a (pre-installed, not evolutionary) brain response to danger from the tree. Maybe someone has a trail-cam installed in the area, and I can sense that. Maybe it's a deer or coyote watching me. Something is there.
The road was soft from rain. I saw deer, turkey, and canine tracks. I didn't see any human tracks, and walked into a couple of spider web strands at face level.