1)
What is the metaphor of falling?
1.
Malbim: It is as if Hashem let go of the cup, and it fell and broke.
2)
Why should lament over Bavel's fall, and take sap to try to cure it?
1.
Malbim: All the nations 1 , for they took shelter in Bavel's shade. They wanted to help it!
3)
Is it possible that it will be cured?
1.
Radak: No. "Ulai Yerapei" is said mockingly.