What is the meaning of "Ki Nir'eh"?
Malbim: After Mo'av is disgraced and dirty with its blood.
Why does it say "Ki Nil'ah Mo'av"?
Rashi: They are weary from fighting the enemy from the towers.
Radak: When it seems that they are weary from crying on the high place, they will be ashamed to stand there.
What is "Mikdasho"?
Rashi: The place that they sanctify and designate to pray there.
Radak citing Targum Yonasan: The house of its god.
Why does it say "v'Lo Yuchal"?
Radak: They cannot go [to Mikdasho] due to their fatigue from crying.
Rid: They cannot remain [in the Mikdash] due to the war.
Kli Paz: Their god cannot do anything.
Malbim: Mo'av cannot stand against the enemy; also its prayer will not strengthen it.