Who are "Rodfai"?
Rashi: It is only Anshei Anasos.
Why should Rodfai be ashamed?
Radak: They say "let Hashem's word come" (7:15). Bring it upon them!
Why should they be afraid, and I not?
Malbim: My prophecy will be fulfilled on them. I will not fear lest they say that I am a false Navi.
What is "u'Mishneh Shibaron Shavrem"?
Radak: Mishneh is not Samuch [to Shibaron], for there is a Segol under the Nun. Rather, it is a second breakage. The same applies to "Kesef Mishneh" (Bereishis 43:15) - second money. There will be breakage after breakage. "Mishneh" does not imply only two; there will be breakage after breakage many times. The same applies to "Mol Es Bnei Yisrael Shenis" (Yehoshua 5:2), like I explained [there].
Malbim: They will be broken at the time of the evil of the Klal, and they will have an early breakage before the evil comes, like I explained above "Hatikem k'Tzon l'Tivchah" (12:3).