Shloka 4.46.7
पृथिवीमण्डलपरिज्ञानम् — Sugriva on Surveying the Earth’s Regions
अथाऽहं कृतबुद्धिस्तु सुव्यक्तं निहतो गुरुः।शिला पर्वतसङ्काशा बिलद्वारि मया कृता।।।।अशक्नुव न्निष्क्रमितुं महिषो विनशेदिति।
athāhaṃ kṛta-buddhis tu suvyaktaṃ nihato guruḥ | śilā parvata-saṅkāśā bila-dvāri mayā kṛtā || aśaknuvan niṣkramituṃ mahiṣo vinaśed iti ||
Then, concluding that my elder brother had surely been slain, I set a rock like a mountain at the cave-mouth, thinking: ‘Let the buffalo be destroyed, unable to come out.’
'Thereafter, convinced that my brother was killed, I placed a mountain-size rock at the entrance of the cave so that Dundubhi will be destroyed, unable to come out of the cave.
Dharma demands right judgment (viveka) alongside right intent: Sugriva acts to end a perceived threat, but his decision is based on a mistaken inference.
Believing Vālī dead, Sugriva blocks the cave with a massive rock to prevent Dundubhi from escaping.
Protectiveness and decisiveness—yet the episode also warns about haste when facts are uncertain.