10 second count, when does it start?

[DC_Ref12]

Originally Posted by PYRef

I would chop in when it is touched and then begin the 10 count when player control begins.

Let's say, though, that there's no contesting of the throw in and player control begins as soon as A2 touches the ball (thrown by A1). Let's also assume that I'm administering the throw-in from the right side of the basket facing upcourt. So I'm on the outside of the shooter, whistle in mouth, my right hand up to signal the clock, and I hand A1 the ball with my left hand and begin the count with my left hand. As soon as A2 touches the ball and has control (again, we're assuming for this case that it's at the same time), I chop the clock in. Then should I use the same hand to do the 10-second count or should I use my other hand?

Sorry, I'm still brushing up on my mechanics.