What is the meaning of "Kol Ketzinayich Nadedu Yachad"?
Rashi: This is Tzidkiyah and his officers, who left [the city] to flee at night.
Radak: Your officers and leaders who escaped and fled. Malbim - the officers fled, and only the weak remained in the city to fight for their lives. This is the opposite of what is natural!
What is the meaning of "mi'Keshes Usaru"?
Rashi: They were incarcerated in the city due to fear of archers.
Radak: Archers pursued [those who fled] and caught them, and incarcerated them. Malbim - it says so in Melachim II, 25:5-6 and Yirmeyah 52:8-9.
Why does it say "Kol Nimtza'ayich Useru Yachdav"?
Rashi: Everyone found in the city were tied together in chains.
Radak: All those found in the city.
Malbim: They are the commoners. They banded together to fight for their lives.
Who fled far?
Rashi: Most people fled far away beforehand.
Radak: Those who hoped to escape; also they were incarcerated.
Malbim: The commoners, after the enemy overpowered.