Malbim: Normally, the lookout calls to the gatekeeper, who asks the king whether or not the person should enter to speak to the king. If it is very urgent, he asks the king directly. The first time he did so, for he knew that the king anxiously awaits to hear from someone who was in the camp, and especially since the person was not heading towards the gate. The second one approaching was not so urgent, for the first will tell everything.