Arjuna sharpens his question with an image that has stayed in memory for millennia. A cloud breaks away from its parent mass. It drifts alone in the sky — too small to bring rain, too disconnected to rejoin the larger cloud. It simply floats, shrinks, and disappears. Nothing comes of it.
Is the fallen yogi like that? Arjuna wonders. This person gave up the pleasures of the world to pursue yoga. But yoga was not completed either. So they are 'ubhaya-vibhrashta' — fallen from both sides. Neither worldly success nor spiritual attainment. No ground under their feet. Just drifting and dissolving.
The fear is vivid and real. It is the fear of the person who changed careers for a dream that did not work out. The fear of the student who left one school for another and finished neither. Arjuna gives that universal anxiety a name and a picture.