[Ref in PA]

For an inbounds pass, the 5 second count ends on the release by the inbounder.

For a pass from backcourt to frontcourt, the 10 second count ends when the ball strikes something with frontcourt status, thus giving the ball frontcourt status (or the ball goes oob). The 10 second count ends when the ball achieves frontcourt status either by pass or by the dibbler getting both feet and the ball in the frontcourt.

Edited: Also the 10 second count begins when the ball is controled in backcourt. The clock should be started (chopped) when the ball is touched legally inbounds.