subsitution

[Adam]

In A and B, blow the whistle, stop play, and have A1 replaced and inform the coach he must wait until the clock runs.

In C, it's too late. Clock has already started running anyway. Play on.

[ma_ref]

Originally Posted by Snaqwells

In A and B, blow the whistle, stop play, and have A1 replaced and inform the coach he must wait until the clock runs.

Not correct (by rule). Ball is at their disposal, and is therefore a live ball. At this point A1 becomes a legal player.