अस्त्रविदाम् displaying their weapons, श्रेष्ठौ best warriors, पुनःपुनः again and again, अस्त्राणि weapons, दर्शयन्तौ looking at, अन्तरिक्षौ in to the sky, उच्छावचान् covering, शरान् arrows, बबन्धतुः network of arrows

Both of them, the best warriors, displaying their weapons again and again looking at the sky covered it with a network of arrows.