Read the story and answer the question.

Margaret was a simple lady who lived in a village with her husband, Robert. They had a daughter named Amy. Everyday at sunrise, Margaret would wake up cook, clean and feed the cattle. Robert would milk the cows and then take the dogs for a long walk. Amy would study, help her mother for sometime and then get ready for school.

Amy studied in a school, which was far away from her house. But she loved going to school. She went with her friends, Ingrid and Rebecca. They would walk together chatting, laughing and singing songs as they went. They had to cross a river on the way. The only way they could cross it was by walking on a narrow bridge.

One day Margaret, Robert and Amy, and her friends were walking on the narrow bridge one behind the other. Amy and her friends were off to school; as usual. Margaret and Robert wanted to go to the market on other side of the river to buy some groceries for the house.

As they were crossing the narrow bridge Rebecca who was right at the back slipped on the narrow bridge. She gave a frightened scream, clutching hold of Ingrid who was in front of her. Both of them lost their balance and fell into the river. Amy clutched her mother in fright. For a moment, she hesitated, and then threw herself into the river after her friends determined to save them.

Margaret screamed, and Robert jumped into the river. Some passers-by also jumped into the river and rescued the children, who were dripping wet, and shivering with fright.

That night, Robert patted his daughter Amy, and said, “You are a brave girl Amy, I’m proud of you."

Why did Robert jump into the river?