1)
What is the significance of "v'Avad Manos mi'Kal"?
1.
Malbim: You cannot flee, for fleeing is lost [even] from a swift person.
2)
Why will he not invigorate his strength?
1.
Radak: Amidst fear, he will panic and lose his strength.
3)
Why does it add "v'Gibor Lo Yemalet Nafsho"?
1.
Malbim: Not only will his Gevurah not help him to defeat the enemy ? it will not even help him to save himself from death.