2 Samuel 18:30

And the king said unto him, Turn aside, and stand here. And he turned aside, and stood still.

The king is the one speaking here, directing his words to Ahimaaz as the first runner to arrive. He orders him to turn aside from his immediate presence and to take a waiting position nearby. Ahimaaz complies, stepping aside and standing still in readiness. The pause keeps him in place while the king turns his attention to hear the second messenger who follows.