SHIT
I mean the country was designed to fit exactly to the edges of the circle, but people don’t work like that. Towns are going to bleed over the edges. What must have been thousands of people lived in communities straddling the circle’s outter edge, and you’re 100% goddamn right about the terrifying things they must have witnessed.
In fact, I’ll bet anything this more or less happened in Xerxes too. People way out on the periphery whose communities got cut down by 50%, or 70%, or 90%, but did not get wiped out entirely. Xerxians who’d gone across the border for a day trip to get water and came back to find their community slaughtered. There might have been small, pocket communities of Xerxian survivors. People Hohenheim never found because the very first thing he did was get the hell out. People who experienced exactly what you described, but never saw it undone.
Holy shit