I think this may have been discussed already but...

[cmckenna]

Thrower in A1 before releasing the ball fakes a throw at B1's face who is defending at the throwin point. As B1 turns breifly in reaction to the action, A1 is able to get the ball inbounds.

I believe the previous responses stated that this may border on unsportsmanlike conduct.

The only warning I gave to the thrower in was that if she broke the plane with the ball that the defender could slap it away.