Sometimes a scene is a physical transition through a place. Direct player action may not even be the primary focus.  For example, there’s a level of play that falls between hexcrawling and navigation between two points, this happens most often in sandboxes but can also happen in any fairly broad setting.  In such situations a large chunk of movement that passes without encounter can be described in a brief sentence, as often happens in literature.  And yet the manner in which it is described, taking into account not only the tone and mood of the terrain as befits the narrative atmosphere, but also the players’ approach to it and feelings about it, can be rendered as a “video montage”.  This allows the GM to paint backdrops and drop exposition and describe the region and spew ephemera – this is a “scene” with a beginning and an end, but it serves immersion more than plot.