1)
Why did he say "Al Mah Atem Botechim"?
1.
'Rashi': Because it says in Melachim II, 18:5, 7 that he trusted in Hashem and rebelled against Melech Ashur, he asks, on whom do you rely to rebel against me?!
2)
Why did he say "v'Yoshvim b'Matzor bi'Yrushalayim"?
1.
'Rashi': You will die of hunger and thirst (verse 11).
