Here is a syntactic parallel for an adverbial genitive with ῥέω.John 7:38 wrote:ποταμοὶ ἐκ τῆς κοιλίας αὐτοῦ ῥεύσουσιν ὕδατος ζῶντος.
Νέφος is a form of liquid. It seems like flowing on a solis is in the accusative. There is also a use with the genitive.Proverbs 3:20 wrote:νέφη δὲ ἐρρύησαν δρόσους
Is there a good example with a genitive so far separated from the word it governs? ποταμοὶ ... ὕδατος ζῶντος seem too far apart.