Having presented Hashem's victory over Pharaoh and his army (Refer to 15:4:1:1*), what is the Torah discussing now?
Seforno: The Torah is now discussing the destruction of the Egyptians who followed the army as they chased after Yisrael to destroy them. 1
What does the Torah mean by "u've'Ru'ach Apecha"?
Rashi: The Torah sometimes speaks about Hashem in human term (a language that we understand) - and when a human king gets angry, he breaths hot air from his nostrils, 1 which comes out in short spurts. 2
Rashbam: It refers to the powerful east wind that caused the water to pile up. 3
What is the meaning of "Ne'ermu Mayim"?
Rashi #1 (citing Targum Onkelos): "By the command of Hashem the water became wise". 1
Rashi #2, Seforno, Rashbam and Targum Yonasan: The water piled up into a heap. 2
And what are the connotations of "Kaf'u Tehomos"?