Help a brother out?

[referee99]

Don't have access to rules book or case plays.

Player A1 is at the free-throw line for 2nd of two free-throws.
As administering official is bouncing the ball to the thrower, Coach from Team B requests time-out.

Official hears the request, and grants the time out since ball was not yet at the disposal of the thrower.

I know there is a case play or rules interp about bouncing the ball to the thrower, it caroms off of their foot, and then there is a request for time-out, which is granted because the ball is not yet at the disposal of the thrower.

I also know that when the ball is dead a time-out can be granted. I also know that the ball becomes live when it is at the disposal of the thrower.

I'm looking for a specific interp that I can pass along to a doubting Thomas.

Anybody have the reference?