C. F. Keil and Franz Delitzsch on 2 Samuel 18:29

2Sa 18:29

In answer to the king’s inquiry, “Is it well with the young man Absalom?” Ahimaaz replied, “I saw the great tumult (that arose) when Joab sent off the king’s servant, and thy servant, and know not what” (sc., had occurred). Ahimaaz spoke as if he had been sent off before Absalom’s fate had been decided or could be known. “The king’s servant” is the Cushite, whom Ahimaaz saw just approaching, so that he could point to him. Joab is the subject, which is sometimes written after the object in the case of an infinitive construction (vid., Gesenius, §133, 3 Anm.); and the expression “thy servant” is a conventional one for “me” (viz., Ahimaaz).