[BillyMac]

Originally Posted by bob jenkins

9-3 ... a pass or fumble which has then touched, or been touched, by another player

So, it comes down to whether an interrupted dribble and a fumble are (or should be) treated the same in these situations. The definitions are nearly identical.

4-21: A fumble is the accidental loss of player control when the ball
unintentionally drops or slips from a player’s grasp.

4-15-5: An interrupted dribble occurs when the ball is loose after
deflecting off the dribbler or after it momentarily gets away from the
dribbler. There is no player control during an interrupted dribble.

A fumble involves a "player's grasp", an interrupted dribble doesn't.

I don't see any "grasp" in this situation (the dribbled ball ball deflects off his shoe), until the very end, which is irrelevant.

Originally Posted by BillyMac

A1 loses control of the ball as a result his own ineptitude (ball deflects off his shoe) which results in an interrupted dribble. Ball legally touches opponent B2's leg. A1 picks up (catches) the loose ball after it touches B2? Can A1 legally start a new dribble?

I believe that Raymond hit the ball out of the park:

Originally Posted by Raymond

That's probably how most of us have officiated it, but it's not what the rule book says.