After taking a closer look, I was completely mistaken. My focus was on the disappearing girls, but they are simply just standing farther back while both Hunter and Meghan step forward onto the podium. It also seems the press was probably corralled into certain areas, so the angles on the cameras are the same, but the positions are different as you can see the height difference of the glass barrier between the WSJ clip and the NTD clip. Also, the camera was a bit shaky at times for the NTD clip, while the WSJ clip is relatively stable.