1)
"Yumas" is passive (he will die. It does not discuss killing). Why does it say "Es [ha'Ish ha'Zeh]"?
1.
Radak: This is for additional explanation. The same applies to "Yeichalek Es ha'Aretz" (Bamidbar 26:55).
2)
What is the meaning of "Al Ken Hu"?
1.
Rashi: This means Al Asher.
2.
Malbim: Yirmeyah says that he weakens the soldiers (their willingness to fight) for their benefit, so they will be saved. They said that Yirmeyah weakens them, not because he seeks Shalom, like he says, rather, for evil - so Nebuchadnetzar will conquer them and exile them.
3)
What is the meaning of "Merapei"?
1.
Rashi, Targum Yonasan: He weakens. Radak - the Aleph is in place of Hei.
