Valmiki Ramayana Yuddha Kanda Sarga 110 Shloka 4
Original Shlokaअर्धयन्रावणंरामोराघवंचापिरावणः ।।6.110.4।। गतिवेगंसमापन्नौप्रतिवेगप्रवर्तने ।
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रावणम् Ravana, अर्धयन् hurting, रामः Rama, राघवम् Raghava, रावणःचापि hurting Ravana, प्रतिवेगप्रवर्तने quickness in retaliation, गतिवेगम् speed of arrows, समापन्नौ happened
Ravana hurting Rama and vice versa displaying quickness in retaliation and speed of arrows, the fight happened.