Final answer:
The term 'medium shot' is used in filmmaking to describe a camera shot framing characters typically from the waist up to capture expressions and body language. It's used here to describe the friends' changing reactions in a scene.
Step-by-step explanation:
The description you're referring to sounds like a scene direction or a note for filmmaking or acting. When discussing a medium shot, you're referring to a type of camera shot in film and television production that frames characters from the waist up, often used to capture facial expressions and body language in a scene. The transition from smiles to expressions of shock would be conveying the friends' realizations that Leigh-Anne isn't joking. This change in expression is a key element in conveying the story's emotional content to the audience and is a crucial aspect of visual storytelling. In the context of film and acting, capturing this shift authentically is essential for conveying the narrative and the characters' emotional journeys.