Valmiki Ramayana 5.42.5

ततस्तं गिरिसङ्काशमतिकायं महाबलम् ।राक्षस्यो वानरं दृष्ट्वा पप्रच्छुर्जनकात्मजाम्॥

tatastaṃ girisaṅkāśamatikāyaṃ mahābalam |rākṣasyo vānaraṃ dṛṣṭvā papracchurjanakātmajām ||

Our plain-language meaning of this verse is waiting for scholar review.