Radak: Also those who will go to captivity, e.g. those who went to Egypt - Yochanan ben Kare'ach and those with him who went willingly, and thought to escape hunger and the sword. They transgressed Yirmeyah's words. The sword caught them, like Yirmeyah told them.

Malbim: This explains "v'Lo Yimalet Lahem Palit" (1). Also the remnant that the enemy will leave alive, and take them captive, they will not escape the sword. From there I will command the sword - they will decree against them Shmad (forbid Mitzvos) and death.

Malbim: I will not leave them to chance. I will oversee them for evil, to punish them via Hashgachah, and not for good.