What is the meaning of "Es Yerivech Anochi Ariv"?
Rashi: I will quarrel Im Yerivech (with your adversary). Radak - Yerivech is To'ar (kind of person). I.e. the one who quarrels with you in Galus; I will save you from amidst them.
Malbim: Do not worry that your master will take you to judgment, like a slave that fled. I will quarrel for you. I will claim that I acquired you first for a slave - "Ki Li Bnei Yisrael Avadim" (Vayikra 25:55).
Why will the Gibor's captives be taken?
Radak: I, Hashem, am stronger than you - I will take them from your hand.
Malbim: Hashem took them from captivity and slavery. Some of Yisrael were Malko'ach (slave) of a Gibor, and some were Shevi Tzedek. Hashem says, not only the Shevi will escape. Rather, even Shevi Gibor, that a strong master guards him, since he was taken improperly, via force, he will be taken forcibly from his captor.
Why does it say "u'Malko'ach Aritz Yimalet"?
Radak citing his father: You say that you captured them justifiably. This is wrong! A tyrant took them via force, and not according to Mishpat.
Malbim: Malko'ach is what an enemy takes for itself, for slaves. Shevi is in the land where he was captured; he is not taken to [the enemy's land] for a slave. Malko'ach cannot escape, for he is under his master's Reshus. Only he can be taken via force - one uses him for a slave, illegally. This is if his master is weak. If he is strong, one cannot take effect the slave. Aritz is stronger than Gibor; even so, his slave will escape on his own (not via a stronger party).
