5.1 Responsibility for the lines
Generally (Diagram 78 and Diagram 79), primary responsibility for the out-of-bounds
decisions are as follows:
Lead official - endline and sideline to his left.
Trail official - centre line and sideline to his left.
When the ball is in transition from the backcourt to the frontcourt, the responsibilities
are divided (Diagram 80).
The other official should not normally interfere in decisions, unless his partner needs
assistance. This will prevent conflicting decisions and jump ball situations.