Who are afraid?
Rashi: The Egyptians [Radak - fear Nebuchadnetzar].
Why does it say "Nisogim Achor"?
Radak: They turn back due to Nebuchadnetzar's army.
What is "Yukatu"?
Radak: They are broken and crushed.
What is the grammatical form of "Manos"?
Radak: It is a noun; its form is like Makom.
What is the meaning of "v'Lo Hifnu"?
Rashi: They did not have time to stand in war.
Radak: They did not turn their faces towards those who chase them. Rather, they fled strongly (rapidly). The double expression u'Manos Nasu shows that they fled strongly.
Malbim: Amidst great fear, they did not turn to see if anyone is chasing them.
What is the meaning of "Magor mi'Saviv"?
Radak: While fleeing, they fear from around, i.e. lest the enemy come from all surrounding directions.
Radak citing Targum Yonasan: [The enemy] gathers against them from around them.
Malbim: Hashem brought fear on them.