When a conversation stays in a shared frame, the listener does not disappear while someone else speaks. Your attention can move between two performances occurring at once.
Give each person a viewing pass
Watch the short exchange once while following the speaker and again while following the listener. Note the moment each changes posture, looks away or handles an object. Avoid counting every movement: choose one that changes your understanding of the exchange.
Compare simultaneous actions
A smile may begin before the sentence ends. A listener may stop working only after a particular word. Those timings can complicate the spoken meaning without requiring a cut to a close-up. Check whether the image is clear enough to support the detail you think you saw.
Finally, watch normally and notice where your attention naturally goes. Lighting, movement and position may draw your eye differently from your deliberate exercise. The interesting question is how the shared view distributes attention, not whether it is inherently better than alternating shots. Both arrangements offer different ways of experiencing the same conversation.