A bright patch or streak crosses the film image, briefly obscuring a face or changing the colour of part of the frame. Instead of looking only through the image at the story, you may become aware of the act of looking through a camera.
Begin by describing the visible event. Where does the light appear, how long does it remain, and what becomes harder to see? Do not identify the lens, lighting setup, or digital process from appearance alone.
Watch the moment before and after the bright interruption. Does a person move towards a window, does the camera change position, or does the effect appear without an obvious visible cause?
An invented scene might let a flare cover a character just as they stop speaking. That coincidence could guide an interpretation, but it does not prove the director’s intention without supporting production evidence.
Try writing the observation first without evaluative words such as beautiful or distracting. Then add your response in a separate sentence. You may discover that the same loss of visibility attracts one viewer and frustrates another.
The strongest discussion connects the effect to a specific change in attention. Naming a technique can help, but it should not replace the more interesting question of what became visible, hidden, or uncertain in this particular scene.
Editorial illustration from this site’s image library; not documentary evidence of the example or object discussed.