Valmiki Ramayana Yuddha Kanda Sarga 89 Shloka 22
Original Shlokaव्यशीर्यतमहद्धिव्यंकवचंलक्ष्मणस्य च । कृतप्रतिकृतान्योन्यंबभूवतुरभिद्रुतौ ।।6.89.22।।
1 source checked for this shloka
लक्ष्मणस्य Lakshmana's, महत् mighty, दिव्यम् wonderful, च कवचम् that shield, व्यशीर्यत shattered, कृतप्रतिकृतान्योन्यम् took offensive as well as retaliated each other, अभिद्रुतौ swiftly, बभूवतुः moving
Lakshmana's mighty and wonderful shield also got shattered. Both took offense as well as retaliated each other moving swiftly.