Assistant Coach in the stands

[splitveer]

Last night we had an interesting situation. About a minute before the game starts an assistant coach walks around the floor and walks up to the top bleacher in the crowd. Then at halftime he comes down and gives information to the coaching staff. He then comes back and sits down on the bench in the second half. To my understanding he would be bench personnel and cannot leave the bench area for any unauthorized reason. So, do we assess an unsporting technical? What if the coach does not come down on the bench in the second half and stays in the stands?