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
ἀγωνάρχης, ο (Α)κριτής αγώνων.[ΕΤΥΜΟΛ. < ἀγών + ἄρχω].