1)
When will they be embarrassed, and why?
1.
Radak: When Hashem will cut the ropes off of us, they will be ashamed of their evil intent for us.
2.
Malbim: They will be embarrassed because they have no portion in Hashem.
2)
What is "v'Yisogu Achor"?
1.
Radak: They will retract from their evil intent for us.
2.
Malbim: They will be turned back via Hashem's punishments.
3)
Do the Goyim hate Tziyon?
1.
Radak: No. They love it, and fight for it! Rather, they hate Bnei Tziyon.
2.
Malbim: They hate Kedushas Yisrael and the G-d who is their strength. Tziyon hints to this; it is the place of Kedushah and Shechinah.