I fought 23 serpents on day 130ish. When battle was decided and enemies were fleeing there was an empty slot in turn order (notice on images, before serpent’s turn). Game stopped when the empty slot’s turn were about to be made. I was able to move camera around the map, but i pressed retreat in hope it could help end battle but it did not.
I attach log, dxdiag, game save just before a fight and 2 screenshots. Got problem with attaching files, cannot add so I also give imgur post with screenshots, let me know if there is anything more I can do to help. https://imgur.com/a/3qTQPja