Are you familiar with how Night Mode works? It takes several exposures and merges them together, resulting in a brighter image in which anything moving ends up blurred. Hence my skepticism that this was Night Mode, since the moving subject is not blurred.
Everything moving does not have to end up blurred. The camera can calculate how objects on the screen are moving, and adjust the pixels accordingly. The same way an optical mouse figures out which way the mouse is moving.