Ramanuja's Commentary
Those antagonists, those belligerent Kauravas will be deriding Arjuna to no end declaring how could Arjuna even think he had the courage to fight against the might of such warriors as we? Others would declare that Arjunas boasts are not to be heard in their presence and other such deprecations like this. He would be the butt of coarse jokes from young and old. Thus would they be freely referring to him in a most degrading and insultingly and abusing manner too much for a ksatriya hero to be able to endure. What pain could be greater than this for him? Surely even death in battle is better than having ones noble reputation detracted. Hence the next verse instructs that for a hero, either course is beneficent: to slay ones enemies fighting bravely in battle or be slain by ones enemies fighting bravely in battle.