It is quite probable that the stand down was a local order and not directed from Washington.
For an incursion (for lack of a better word) into a foreign sovereign country without a status of forces agreement with the US you will require a presidential order. It is quite probable that the first step in a two step process was taken, local forces were placed in a ready status and were required to prepare for a mission. The second step is the one not taken, look for a presidential order to actually carry out the mission be found to be lacking. If, after a reasonable period, the presidential order is not received the local commander may order his troops to stand down from their ready status.
Just my take, watch for it.