Heres an example of something you guys can set up next time you are doing some drills.
1. Freeze two object balls and try to hit them straight in the middle.
Observe what the cue ball does. Now, purposely hit the object ball on the
right ever so slightly and again, watch the cue ball. Then do the same with the object ball on the left and observe.
Now, try and hit the exact center with both a soft stop shot, top and then a little bottom. Watch what happens.
2. Separate both object balls. You can try a few with the object balls, say 1/4, 1/2 and 1 inch apart and do the same steps as described in number 1.
If you are interested enuff to study this drill, it will make you much more aware and better qualified the next time someone asks you to ref a shot like these two.
Give it a whirl, its actually fun and you will learn something new. After you are confident that you know where the cue ball and object balls are going, ask a buddy to make these shots for you, while you are standing over the balls and see if you are confident
to make accurate calls on these shots.
If you do them correctly, you will see a pattern with the cue ball that will happen 99.9% of the time.
Then, with the balls separated, ask yourself what happens if the shooter uses either right or left english to throw either ball.
Now we're getting into some fun stuff,right?
And by all means, please visit Dr. Daves site and take the ref quiz. See how you do on the calls, watch the video again and make the calls once more and see if you can improve your watching skills. It definitely was a benefit for me. Dave also has a couple of little eye openers on there as well.