Loose-ball plays are discussed in 10-3. You may have to wait until the end of the down to determine if a foul occurred during a loose-ball play.
In 1: All of the action that occurs before A2 picks up the ball is action during a loose-ball play. All of the action from the time A2 picks up the ball until the down is ended is part of A2's run and is a running play. Since the foul by B5 occurs after A2 gains possession, it is part of a running play and the enforcement spot is the end of the run.
In 2: Since the facemask occurs prior to A2 picking up the ball, the foul is during a loose-ball play. The enforcement spot is the previous spot.
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