Sforno on Exodus 14:27/ספורנו על שמות י״ד:כ״ז

1לאיתנו, the waves returning into the trough created by the waters having been split.

2ומצרים נסים לקראתו, since the morning watch of the day the hand of G’d had been actively deployed against them to confuse them. That is when they first articulated the decision to flee. (verse 28) They kept fleeing along the trough created by the splitting of the waters until morning. At that time the waters began to reverse themselves meeting the Egyptians who were now near the wrong end of this trough, head on.

3וינער ה' את מצרים, G’d tossed Egypt, King and all from all the chariots to the bottom of the sea. The verb נער occurs in the same sense as here in Nechemyah 5,13 חצני נערתי, “I shook out my garment.” We also find this term used in this sense in Isaiah 52,2: התנערי מעפר, “arise and shake off the dust!”