Dr. Sadao was a patriotic Japanese as well as a dedicated surgeon. He honoured both the values excellently., it, was his duty, as a surgeon was to save the life of a man irrespective of caste, colour, or creed. For a doctor, his patient is beyond any prejudice. When Dr. Sadao saw the white man, he realised that the man would die if he was not immediately operated upon. So, he took the man to his house and treated him and saved his life. That was his duty as a dedicated surgeon.
Dr. Sadao was a loyal citizen of Japan and a true patriot. So, when he went to the General, he told him everything and sought his help. Dr. Sadao had no pity for the white man and considered him his enemy. The General assured to send his assassins but forgot. So, at the end, Dr. Sadao had to help the prisoner of war to escape from there.
