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
η (AM ἐρυγή) [[[ερεύγομαι]] (I)]1. βλ. ερευγμός2. φωνή, βρυχηθμός.