Anymore, Fort Hill and Allegany basically play one team each season that can wear on them physically - and that's each other. And when I mean wear on them physically, I mean persistent pounding and not just hard hitting from tackler and running back. Trench warfare, so to say, where you know that you are going to have to go through someone each and every play.
FH just played two of those teams in a row. Friendship more than Melbourne from early reports, but it definitely takes it's toll. That physical exhaustion is when mental mistakes begin to happen.
I'm in no way comparing Friendship to Chestnut Ridge, but I think it's similar to what happened to Allegany. They played a fairly physical team in Dunbar (similar style to Melbourne) and then an even more physical team in Chestnut Ridge. The drain in back-to-back games against the more physical teams got to both. If both teams had played Silver Oak in between, the results would have been different for the second game.