The Shirah describes the death of the Egyptians in 3 Different Ways. Why?

Pharaoh’s chariots and army, He hurled into the sea; and his elite officers were drowned in the Sea of Reeds.  

הֹ אִישׁ מִלְחָמָה הֹ שְׁמוֹ 

Hashem is master of war Hashem is His Name

עָזִּי וְזִמְרָת-הּ וַיְהִי־לִי לִישׁוּעָה זֶה -לִי וְאַנְוֵֽהוּ אֱלֹ-י אָבִי וַאֲרֹמְ֒מֶֽנְהוּ
The strength and retribution of G-d was the cause of my deliverance;this is my Al--mighty and I will glorify Him, G-d of my father and I will exalt Him 

Horse and driver He has hurled into the sea. ס֥וּס וְרֹכְב֖וֹ רָמָ֥ה בַיָּֽם׃

We Begin Az Yashir.. Them Moshe shall Sing

אָז יָשִׁיר־משֶׁה וּבְנֵי יִשְׂרָאֵל אֶת־הַשִּׁירָה הַזֹּאת 

אָז יָשִׁיר־משֶׁה וּבְנֵי יִשְׂרָאֵל אֶת־הַשִּׁירָה הַזֹּאת 

וְהַיָּם֙ בָּקַ֣עְתָּ לִפְנֵיהֶ֔ם וַיַּֽעַבְר֥וּ בְתוֹךְ־הַיָּ֖ם בַּיַּבָּשָׁ֑ה וְֽאֶת־רֹ֨דְפֵיהֶ֜ם הִשְׁלַ֧כְתָּ בִמְצוֹלֹ֛ת כְּמוֹ־אֶ֖בֶן בְּמַ֥יִם עַזִּֽים׃

 You split the sea before them; they passed through the sea on dry land, but You threw their pursuers into the depths, like a stone into the raging waters.