This procedure of the Ksatryas was laid down by the ancient preceptors that a kşatrya, when slain in battle should not be mourned for.
इयं हि पूर्वैः संदिष्टा गतिः क्षत्रियसंमता। क्षत्रियो निहतः संख्ये न शोच्य इति निश्चयः॥