1)
Why did they say "ha'Ish"? There were 600 men with David!
1.
Malbim: They were concerned only for David. They used to take Yisraelim for war (14:21).
2)
Why did they say both "Lo Yered Imanu ba'Milchamah" and "Lo Yiihyeh Lanu l'Satan ba'Milchamah"?
1.
Malbim: He should not go to fight with us, and not guard the king.
3)
What are "ha'Anashim ha'Hem"?
1.
Radak: It is a euphemism for themselves. (He will kill us to appease Sha'ul.)