1)
What is the meaning of "Ani ch'Ficha la'Kel"?
1.
Rashi: You wanted to debate with one who will not scare you. I am in place of Hashem; I speak His words for Him!
2.
Ibn Ezra: I am like your words and thoughts with Hashem. It is as if he said 'I am like you' - "Ish k'Fi Mehalelo."
3.
Malbim: I am like your words to Kel. You requested that Hashem debate with you in a way that you can sense, and you will not be terrified of His grandeur or punishment. I am in place of Him.
2)
What is "Koratzti"?
1.
Ibn Ezra: I was cut. This is like "Keretz mi'Tzafon."
2.
Malbim: I debate with you in place of Hashem. You sense me - also I was cut (formed) from physicality!


