About this scene
Red light at an intersection, two-lane road, mid-morning. He's in the driver seat. She pulls up next to him in her own car, casual look over her shoulder to check the lane, and her face changes the moment she sees what's in his lap. The light is red for forty more seconds. She has the whole time to process. She looks back twice more before the green. Then she pulls away faster than she was going to.
What to watch for
The face progression is the whole video. Initial neutrality, sudden recognition, processing, and then the deliberate refusal to let it show. The first look-back is the involuntary one. The second is curiosity. The third is right before the green light and is more direct. She does not roll up her window. She does not speed off. She keeps her car next to his for the full duration of the red light, which means she chose to stay there.