Because he not only successfully rescued the boy, also completed a self-help, out of fear of water, he saw the little boy and his mother embraced, very happy.
Because he not only succeeded in saving the little boy, but also completed self-help, get rid of the fear of water, he saw the little boy and his mother hugging each other, very happy.
Because he not only successfully rescued the little boy, but also completed the self-help and got rid of the fear of water. He saw the little boy and his mother tightly embracing each other and was very happy.