Valmiki Ramayana Yuddha Kanda Sarga 56 Shloka 15
Original Shlokaआत्मानंमप्रहरणंज्ञात्वाक्रोधसमन्वितः । शैलमुत्पाटयामासवेगेनहरिपुङ्गवः ।।6.56.15।।
1 source checked for this shloka
हरिपुङ्गवः Vanara leader, आत्मानम् himself, अप्रहरणम् without any weapon, ज्ञात्वा knowing, क्रोधसमन्वितः full of anger, वेगेन quickly, शैलम् mountain, उत्पाटयामास took up.
Vanara leader himself knowing that he is without any weapon, full of anger took up a mountain quickly.