An enemy who sets fire to the house, administers poison, attacks all of a sudden with deadly weapons, plunders wealth or usurps agricultural fields, or entices one’s wife is called an aggressor. Such an aggressor, though he be a brāhmaṇa or a so-called son of a brāhmaṇa, has to be punished in all circumstances. When Arjuna promised to behead the aggressor named Aśvatthāmā, he knew well that Aśvatthāmā was the son of a brāhmaṇa, but because the so-called brāhmaṇa acted like a butcher, he was taken as such, and there was no question of sin in killing such a brāhmaṇa’s son who proved to be a villain.