Valmiki Ramayana Yuddha Kanda Sarga 56 Shloka 24
Original Shlokaतमन्तकमिवक्रुद्धंसद्रुमंप्राणहारिणम् । हनूमन्तमभिप्रेक्ष्यराक्षसाविप्रदुद्रुवुः ।।6.56.24।।
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क्रुद्धम् angry, अन्तकमिव like spirit of death, सद्रुमम् those trees, प्राणहारिणम् took life, तंहनूमन्तम् that Hanuman, अभिप्रेक्ष्य seeing, राक्षसाः Rakshasas, विप्रदुद्रुवुः took to heels.
Hanuman, enraged like the spirit of death, took their life (Rakshasas) armed with trees and on seeing him the Rakshasas took to their heels.