I see the stranger turn away from the portal, but it clearly pains them. The recording shows their reluctant steps away

I see the stranger turn away from the portal, but it clearly pains them. The recording shows their reluctant steps away from the threshold, their repeated glances back over their shoulder. The recording continues as the crew and the stranger part ways. The group heads towards a settlement in the distance, the stranger towards the empty horizon. As the images jump forwards, the stranger spends their time hauling large red minerals to a small shelter. They carve them endlessly, a parade of geometric shapes rendered in crimson stone. They fall down, exhausted. I cannot fathom any meaning from the glyphs they carve.