As for the first situation, whether or not it's a violation as Nev stated above also depends on whether the ball was at A1's disposal. If the players are jockeying for position and A2 steps out before the official put's the ball at A1's disposal, it's a dead ball and there is no violation.
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"It is not enough to do your best; you must know what to do, and then do your best." - W. Edwards Deming
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