Initial direction of the pass on field.
The initial direction of the pass determines whether it is a backward or forward pass. The definition of a forward pass is one that is towards the opponent's end line. The definition of a backward pass is one that is parallel with the line of scrimmage or towards the passer's end line.
Therefore, to answer your question, the initial direction of the pass relative to field markings determines whether it is a forward or backward pass.
A is a player on the team that snaps the ball to begin a play. B is the opponent. In your example, I believe you should designate the players as A1 and A2.
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Mike Simonds
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