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sa tada labdha-tirtho ’pi
na babadhe nirayudham
manayan sa mrdhe dharmam
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Even though the demon had an excellent opportunity to strike his unarmed foe without obstruction, he respected the law of single combat, thereby kindling the fury of the Supreme Lord.