Bhishma said A Kshatriya must not put on armour for fighting a Kshatriya who is not clad in coat of mail. One should fight one, and leave the opponent when the latter becomes disabled.
भीष्म उवाच नैवासन्नद्धकवचो योद्धव्यः क्षत्रियो रणे। एक एकेन वाच्यश्च विसृजेति क्षिपामि च॥