In this scene, the whole story starts. Sadao and his wife find the unconscious American soldier Tom on the shore and decide to take him to their house until they decide what to do with him. This scence leads to the whole sequence of events described.
In the scene where Sadao leaves the General's palace after the latter promising to send assassins for Tom, Sadao's sense of loyalty to Japan, for the first time, overcomes his medical morals and care.
In Sadao's escape plan for Tom, the story settles with his humanity, kindness and morality winning over his sense of duty and loyalty to Japan. This part of the story conveys a strong message about acceptance and open mindness.