Valmiki Ramayana Yuddha Kanda Sarga 70 Shloka 46

महाकपिः great monkey, तेन by that, मुष्टिप्रहारेण by the hit with fist, सञ्चुकोप became furious, कुपितः च and angry, राक्षसर्षभम् bull among Rakshasas, किरीटे crown, निजग्राह got hold of.

The great monkey hit by the fist (of Trisira) became furious and in anger he got hold of Trisira's head with crown.