Camera set to manual, exposure for the sky (a long story why, but we were a bit late finding a spot for the shoot, hence the iso800)
An FL-50 to the left mounted on a stand, on full pop into a reflector so the light spread back up the path and onto the field.
Got my "volunteer" to ride up and down and each time he passd the right point, I zapped him :-). We had time for about 3 shots before the light in the sky went.
Also used manual focus as it was getting really dark.