1)
What net will He set for him?
1.
Rashi (from Pesikta Rabasi 22): [Tzidkiyah] had a cave from his house to Arvos Yericho. He left via the cave. Hashem summonsed a deer to run in front of the Kasdim on top of the cave. They chased the deer, and when they reached its opening in Arvos Yericho, they saw him leave, and captured him.
2)
Why will he not see Eretz Kasdim?
1.
Rashi: In Rivlah, "va'Ydaber Ito Mishpatim" and gouged out his eyes; afterwards, he brought him to Bavel (Yirmeyah 52:9-11). Malbim - covering his face and not seeing (12) hints to this.