1)
What is the meaning of "Motzi'im El ha'Kasdim"?
1.
Radak: The ones who expel, they will take them out. This refers to people of the city, or Bavliyim who entered the city when they conquered it. They took them out to the Bavliyim outside.
2.
Malbim: They take them out to judge them for enticing you. This is why they killed Tzidkiyah's sons.
2)
Why does it say "Tisrof ba'Esh"?
1.
Rashi: It will be as if you overtly burn it, for you cause it [Radak, Malbim - via not going out to them to make peace].
