The basic idea is to get the best look at each play as is possible. This means that officials must be cognizant of the need to change ones physical presence on the floor to a different and more advantageous position when the ball moves to a new position on the floor. It is unlikely that an official can stand in one spot on the floor and maintain open looks at the ball when the ball has changed position several times. It is unlikely but we see officials do this all the time. “Move to Improve” your look at the play.
As the ball changes position in an officials primary area of responsibility the official must adjust his or her position on the floor to maintain the best possible look at the action. Quick effective ball movement will “straight line” officials in and of itself. When that occurs officials must respond with quick,short and compact movement that will reestablish an open look.
The greater sin is to be straight lined by our own lack of movement.
If the ball crosses the covering officials mid line going left, the quick movement by the officials is to the right and if the ball moves across the mid line to the right, the movement is to the left. If the ball moves but doesn’t cross the officials mid line, probably the correct movement is to follow the action.
We not only position adjust to maintain “looks” on ball handlers but we move to get the best look at out going and incoming “cutters,” screens and post players. A rotation initiated by the lead is nothing more than a position adjustment.
In the video clip below the trail official adjusts his position to better view the action of the dribble driver and the defender.