The light is largely natural, inasmuch as it was running roughly sideways to the sunrise.
We saw it running towardsa waterhole from some distance and got there just in time to get three shots, so unfortunately no chance of changing position.
Thanks for your explanation, I had never even heard of this before. But I regularly find amazing new functions that you would never know were there certainly not by reading the instruction books.
Here is another try which I think is about halfway.