1)
Why did Hashem say "Chaleleichem? Hemah ha'Basar"?
1.
Malbim: Do not think that the wall will be like a pot to protect you. Only your dead bodies will remain inside.
2)
Why does it say "Hotzi"?
1.
Rashi: This is like Lehotzi. You built houses in vain, for you will go to Galus ? fathers and children, No one will inherit the houses!
2.
Radak: This is Makor (like an infinitive), in place of Otzi. I.e. I decreed to remove you from [the city] ? unlike you think.