Why does it say "ha'Motzi Rechev va'Sus"?
Rashi (16): He made Egypt (Metzudas David - He put in their hearts to) chase after you [into the sea] - chariots, horses, soldiers and Izuz (Targum Yonasan - many people).
Radak: After mentioning the miracle at Yam Suf, it mentions the miracle with Sancheriv. I.e. the One who did these miracles for you, He will do for you further in Bavel. He will take out the army of Melech Ashur with chariots and horses and bring them to Eretz Yisrael - "Yishrok Hashem la'Zvuv Asher bi'Ktzei Ye'orei Mitzrayim vela'Devorah Asher b'Eretz Ashur" (7:18), "Ashur Shevet Api" (10:5). Hashem took them out, and will make them fall in Yerushalayim.
Malbim: At the same time that I saved Yisrael, I drowned Egypt.
What is the meaning of "Yishkevu Bal Yakumu"?
Rashi (16): They lied dead on the sea shore, and did not rise.
Radak: When Machaneh Ashur lie down at night, they will not rise - "va'Yashkimu va'Boker v'Hinei Kulam Pegarim Mesim" (37:36).
What is the meaning of "Da'achu ka'Pishtah Chavu"?
Radak: They died in a moment, like flax, which burns and extinguishes quickly. Da'achu is like Chavu.