διὰ λαμπροτάτου βαίνοντες ἁβρῶς αἰθέρος → passing lightly through clear-shining air (Euripides, Medea 829)
in few words: P. and V. ἐν βραχεῖ, P. διὰ βραχέων.
suddenly: P. and V. ἐξαίφνης, P. αἰφνιδίως.
