ततः पर्वतशृद्भाभ्यां सहसैव विनि:सृत:
tataḥ parvataśṛṅgābhyāṃ sahasaiva viniḥsṛtaḥ
Then, bursting forth at once with sudden force from between the mountain-peaks, he emerged.
भीष्म उवाच
The verse uses a vivid image of sudden emergence from mountain-peaks to suggest the irresistible momentum of certain outcomes—when conditions ripen, results manifest swiftly and powerfully, reminding one to act with foresight and restraint.
Bhīṣma describes someone (implied by the masculine singular viniḥsṛtaḥ) suddenly coming forth from between mountain-peaks, emphasizing abruptness and force in the unfolding scene.