Throwing to Unoccupied base interpretation

[JamesBCrazy]

Disclaimer: I only know OBR, not Fed.

If a runner is attempting to advance to a base, a throw or feint to that base is almost certainly enough to be called "making a play" on that runner.

Under OBR, a pitcher turning toward 1B or 3B does not create an obligation to step toward that base; he is free to continue turning and throw to 2B (assuming the throw to 2B is otherwise legal.) I'd imagine it's the same in Fed, but considering that fakes to third are legal there, the coach has even less of a leg to stand on.