When to start 10 second count?

[bucky]

Originally Posted by Nevadaref

SITUATION 8: A1 is dribbling in his/her frontcourt when B1 deflects the ball into A's backcourt. The ball is bouncing toward the end line in A's backcourt while A1 and B1 give chase. B1 and A1 each contact the ball, but neither gains control. Finally, after numerous attempts by each player, A1 gains possession deep in A's backcourt. When does the 10-second count begin anew for Team A? RULING: The count starts as soon as the ball goes into the backcourt since team control has not ended. (4-12-3; 9-8)

Rule 9-8 says: A player shall not be, nor may his/her team be, in continuous control of the ball which is in his/her backcourt for 10 seconds.

I am having an absolute brain freeze. Cortex won't work...except to type. On a throw-in to the BC, the count is not started until there is player control in the BC. What citation explains that the 10 second count is started with player control and not simply when the ball is in the BC? (b/c there is still team control during a throw-in)

Example: A1 releases the ball on a throw-in to the BC and the ball slowly rolls in the BC for 4 seconds without being touched. A2 gets the ball and the official begins the 10-second count. Why does the 10-second count not start when the ball is inbounds rolling untouched, after all Team A had team control?

I know the rule, just can't find where it is documented. Or does this fall under the reasoning that there is no documentation needed because TC on a throw-in only applies to foul situations? I just can't remember. Thought there was something specific.