τὸ δ' ἐξαίφνης τὸ ἐν ἀναισθήτῳ χρόνῳ διὰ μικρότητα ἐκστάν → suddenly refers to what has departed from its former condition in a time imperceptible because of its smallness
inversĭo: ōnis, f. inverto,
I an inversion.
I Verborum, i. e. an ironical inversion of meaning, Cic. de Or. 2, 65. 261.—
II An allegory, transl. of Gr. ἀλληγορία,> Quint. 8, 6, 44.—
III A transposition, i. q. ἀναστροφή> (as quoque ego for ego quoque), Quint. 1, 5, 40.