ready for Africa. If you have some brushy land, set up 6 or 8 targets at various distances, without Doug knowing where they are. The best thing is to go to an archery shop where they have the full size color deer targets and such, all color with no red dot to shoot at. Very few African animals have red dots on their chests. Staple these targets to cardboard and set them in the brush.
Start your walk thru with you right behind him with the sticks. When he sees the first target, you run up and place the sticks in front of him (just like the tracker or PH will do) and start counting. If he can't get the shot off within 6 or 7 seconds of you placing the sticks in front of him, consider that a missed target. Then go to the second target and do the same thing. At the end of the walk, if he gets half of the targets in the kill zone in 8 seconds, consider that OK. While you are reloading or changing guns, get one of your boys to go out and place the targets in a different place and do it again.
Then in the second stage, do it without the sticks. Quite often in Africa you will see an animal and need to get the shot off but there is no place for the sticks. So place the targets where they can be seen from large rocks or a tree, where he can lean against the tree or lay on top of the rock to get the shot off. Or in an open area where he can lie on his stomach and take the shot prone.
All this practice will help a LOT. Very seldom do you get a shot off a solid object. Normally it is sticks, a tree, a boulder or even some short brush. I also have taken shots off the leg of the sticks when shooting from the top of the sticks won't get it. I sit down with one of the legs of the sticks between my legs and brace the gun against that leg of the sticks by holding the stick with my left hand and laying the gun on top of my hand and take the shot off that.
No shot in Africa is easy so all the unusual practice you can do will help.