[referee99]

C. Trail Official
1. Take a position just above the free-throw line extended and halfway between the nearer free-throw lane-line extended and the sideline.
2. Be primarily responsible for holding or beckoning substitutes and any other table activity.
3. Observe players in the backcourt.
4. When the thrower receives the ball, begin a visible 10 count with wrist flicks.
5. Observe the thrower and top two spaces on the opposite lane line for violations; give the appropriate signal immediately if either team violates. See Diagram 2-12
6. Observe the flight of the ball and note whether the ball goes through, contacts or misses the ring.
7. Close down when the ball contacts the backboard or ring and officiate rebounding action in PCA.
8. Watch for goaltending or basket interference.
9. Signal to start the clock if the final throw or the first throw of a one-and-one is unsuccessful and the ball is to remain live.