Station 8 was described to me when I started shooting skeet as a knee jerk shot and it is a reactionary shot, especially when shot with gun not mounted which can be done.
Shooting sporting clay with gun unmounted is the only way I do it. To experiment, I tried to shoot sporting clay with gun mounted to see if I shot better, and I shot worse. Pre mounting your gun before you say pull has it's obvious advantage, but saying pull with gun down has it's own advantage, and that advantage is that you can better see and focus both eyes on the target when your gun is down. Looking at that diagram I posted above, when that clay first comes out, it is a blur. When it gets to "look", your eyes are just begging to bring the clay into focus, once you have both eyes full focused on clay (which is a hell of a lot easier without your gun in your face), and your eyes have clay in "missile lock", then mount your gun and pull the trigger as soon as gun hits your face.
And this is what you want to do when you are hunting. When those birds coming in, your gun will be down, and you do not want to move at all or you will flare the birds. You sit perfectly still, only thing moving is your eyes, if it is a flock of birds, pick one bird and "missile lock" on it, then mount when bird is in range. Your mount needs to be instinctive with repetitive practice, a pro will have you do 25 to 100 mounts every day in front of a mirror, but focusing on the target and "missile locking" on target is what you need to be thinking about when those birds are coming in. This "missile lock" concept is very important and something I have to remind myself about, when you do this, everything slows down and becomes much easier.
This short 17 second YouTube I loaded in 2009, was on a duck lease I had. I called it a station 8 shot. It was me and may son (12 yrs old), video starts you can hear him "Oh dad they are coming around behind us...", you can see them, a pair of ringers, left to right behind our blind in a blur, then the whistling wings as they fly over the camera, first shot I take is the station 8 shot, I absolutely obliterated the bird, #4 shot, I'm not kidding guts spattered all over the blind. My son smokes the 2nd one.