1)
What is the connection of "Yom Nakam" and "Shenas Ge'ulai"?
1.
Radak: Yom Nakam was in My heart a long time, until "Shenas Ge'ulai" came. Then will be the day of vengeance on the nations.
2.
Malbim: It was a day designated for vengeance against Nochrim. It came, and also "Shenas Ge'ulai" to redeem Yisrael. Therefore I did not delay to stomp them.