出埃及記 14:29 註釋：Ibn Ezra, Rashbam, Sforno & Or HaChaim

And the Children of Israel: The explanation of mentioning this another time is because Pharaoh was drowning while there were still Israelite people crossing. And this was a wonder within a wonder. For in the place that Israel was crossing the Sea, there was an eastern wind drying [the water]; but in the place where Pharaoh and his army were, God brought a different wind to melt the waters that had congealed and became walls. But behold, the two winds were [both] in the Sea and the two places [within it] were close [to each other]. And the testimony for this understanding is that it is written in the Song [of the Sea] (15:8), "With the wind of  Your anger, the waters piled up" - and that is the wind that was with Israel; but it is [also] written (15:10), "You made Your wind blow, the sea covered them" - and that is the one that drowned the Egyptians...

ובני ישראל הלכו, all this while the Israelites had already completed crossing the sea while its bed was completely dry.

ובני ישראל הלכו ביבשה, all the while the Egyptians experienced all these problems and were drowning, the Israelites had been walking trough the sea as if it were dry land. The areas still being traversed by Israelites were not affected by the sea reverting to its originals state.