1)
Rashi (10) writes that Melech Ashur said this before he conquered Shomron. Here it implies that he already conquered it!
1.
Rashi: This verse he will say after he conquers Shomron.
2)
Is there a difference between Elileha and Atzabeha?
1.
Radak: They are the same; the matter is repeated in different words.
3)
What does this verse add to verse 10?
1.
Malbim: If you will say that Elokei Yisrael is stronger than all gods of the nations, and He can save Yerushalayim from me, He is G-d also of Shomron, and He did not save it from me!