1)
What did Melech Mo'av see?
1.
Radak: Initially he fled to Kir Charases. He thought to take refuge there. When he saw that the war was overpowering him 1 , he tried to break through to Melech Edom.
2.
Malbim: The war was overpowering him, i.e. he cannot defeat them from the wall, and they will conquer the wall. (PF)
2)
Why does it say "Chazak (masculine) Mimenu ha'Milchamah"?
1.
Radak: Davar (the matter of the) Milchamah was overpowering him.
3)
Why did he try to get to Melech Edom?
1.
Radak: Perhaps Melech Edom was closer to the city than the other two kings.
2.
Malbim: He was weaker [than the others]; he wanted to seize him.