atra dvayī kalpanā / vinaṣṭād vā kāraṇāt kāryaṃ bhaved avinaṣṭād vā / naṣṭānaṣṭavinirmuktasya vastuno 'bhāvāt
Here there are two possibilities: either the effect arises from a destroyed cause or from an undestroyed [cause], since there cannot be anything free from [being either] destroyed or undestroyed.