Valmiki Ramayana Yuddha Kanda Sarga 97 Shloka 30
Original Shlokaददर्शान्तरंतस्यविरूपाक्षस्यवानरः ।।6.97.30।। ततोन्यपातयत्क्रोधाच्छङ्खदेशेमहात्तलम् ।
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सःवानरः that Vanara, तस्यविरूपाक्षस्य that Virupaksha's, अन्तरम् blow, ददर्श seeing, ततः thereafter, क्रोधात् angered, अन्यत् other, महात्तलम् big palm, शङ्खदेशे on the temporal bone, पातयत् fell
The Vanara, seeing the blow given by Virupaksha, enraged Sugriva hit him with another palm on the temporal bone by which he fell.