Interesting photo.
Someone will ask "What is it like to shoot Red grouse over a heather backdrop?" This image will do much to explain it.
It's not flat.
The ground before you undulates like the ocean surf.
So, if you've ever shot sea ducks between the swells, that's a good start.
Now you see me, now you don't.
They are more or less at eye level.
But then, because they want to increase the sport, they tipped the sea bed on a 40 degree angle, and then, cut the butts into the hillside level and flat.
So, this image was shot dead level out front, zoomed in to about 35 yards, on a fellow picking my birds. I was in a end butt for this drive, and he had been "Flanking" to my right, so several birds were laying near his post.
So, in some sort of summary, the shooting is like teal, or Chukar, between the waves, tipped on a skew, either uphill, or down and away.
Many of my shots bristled the feathers across their backs, causing me to have my loader remind me in mid mount, "Under the chin, under the chin". Even what appear as straight on shots are actually downhill curlers. Very frustrating for a "cover the bird" kind of guy.
From my sick bed.