Why did Moshe use the title "Elokei ha'Ruchos"?
Rashi: Assuming (mistakenly) that Hashem was about to destroy all of Yisrael, Moshe pointed out that following a rebellion, human kings cannot distinguish between those who sinned and those who didn't, punish them all, but Hashem, who knows the thoughts of man, certainly can . 1
What did Moshe set out to achieve with his Tefilah?
Rashi and Ramban #1 (citing R. Chananel): He prayed that Hashem should change His mind and punish only Korach, Dasan and Aviram. 1
Ramban #2 and Targum Yonasan: He set out to remove the punishment from the people 2 and to place it fairly and squarely on the shoulders of Korach and his henchmen, 3 who were directly responsible for the rebellion, as is the way of those who plead for mercy on behalf of the masses. 4
Why did Moshe say "Elokei ha'Ruchos" in the plural?
Targum Yonasan: 'The G-d who placed a Ru'ach Neshamah in the body of Yisrael and a Ru'ach in the bodies of all mankind. 1
See Na'ar Yonasan.
Why did Moshe and Aharon fall on their faces this time?