Kick Ball on AP Throw-in

[BktBallRef]

Originally posted by rainmaker
Why not redefine the throw-in to end when the ball is LEGALLY touched in-bounds, and then as with running the end-line, the offense wouldn't be penalized for B's violation.

Why? On the next throw-in, when A does complete the throw-in, B's gonna get the arrow anyway.

I don't see how A is being penalized.