How would readers be affected if this story were told with a third-person omniscient point of view?
They would understand what Mac is thinking when
he buckles Andy's leg.
They would hear the mother's thoughts, even
though she is not in the scene.
They would understand Mac's thoughts instead of
Andy's thoughts.
They would draw their own conclusion by reading
only actions and dialogue.
And
The answer is “they would understand what Mac is thinking when he buckles Andy’s leg”