I just watched this movie yesterday. The plot was quite simple, deliver a message. Most of us have had the occasional experience of doing something simple that is also damned hard to do.
What I enjoyed about the movie were the one-take scenes where the camera follows along without cuts. It had to require a ton of planning and practice to get those long scenes right. The scene in Écoust as Schofield walks in the light of flares was quite amazing. It required a camera with high dynamic range to capture the contrasts between dark and light. Suffice it to say, I enjoyed the production more than the story.
