1)
Why does it say "v'Amitz Libo ba'Giborim"?
1.
Radak: Gevurah is in the heart. Even a Gibor in the heart, his heart will soften and he will not stand against the enemy.
2.
Malbim: Even if among the Giborim will be found one who is bravest, it will only enable him to flee.
2)
Why does it say that he will flee naked?
1.
Rashi: He will be naked, i.e. without weapons.
2.
Radak: He will remove his clothes, lest they be heavy on him, so he can flee faster.
3.
Malbim: The bravest Gibor will flee and save only himself, but not his money or clothes.
