Principle: A person has got a right to defend his life or that of any other person.
Factual Situation: Sonia was returning home from work at about 10:00 pm. The cab driver dropped her at the gate of her residence. Suddenly she heard a male voice telling her to hand over her purse and Mobile. She screamed to draw the attention of her driver but the driver did not hear her and drove away. When she looked back she saw a man pointing a dagger at her. She was about to hand over her purse to the man. Hearing her cries, her neighbour, Major Singh, a military officer, looked through his window and saw the scene. He took out his gun and shot the man dead, later identified as X.