If you are a point guard or a wing, you are most likely going to use different types of ball screens throughout the course of a basketball game. However there are different reads that you need to make off of a ball screen depending on how the defenders play it. You need to be strong in your basketball fundamentals, and being able to read how the defense is guarding each ball screen.
The action that you are working on in this basketball drill is turning the corner when the big man doesn't get all the way out to show on the screen. Either the big man is slow getting out or they take a bad angle, but this opens up the chance to attack their outside hip and get the angle to turn the corner.