Who has no helper?
Rashi: Yisrael.
Radak: Refer to 59:16:2:3 and the notes there.
Malbim: Hashem; the generation do not have merit to 'help'. Therefore, "Zero'i" will save.
What is "v'Eshtomem"?
Rashi: It is an expression of silence, like I explained above (refer to 59:16:2:1).
Why does it add "v'Ein Somech"?
Malbim: No one prays for them. Therefore, "va'Chamasi Hi Semachasni." This is the anger at the Nochrim's sin.
How did His anger support Him?
Rashi: My anger at the nations, that "Ani Katzafti Me'at v'Hemah Azru l'Ra'ah" (Zecharyah 1:15), this aroused My heart to exact payment from them, even though Yisrael were not worthy of and proper for Ge'ulah.
Above, it says (59:16). Why does it say here "Zero'i va'Chamasi"?
Radak: I explained above Zero'o regarding "va'Tosha Lo Zero'o v'Tzidkaso" (refer to 59:16:4:2). Chamasi is vengeance against the Goyim at the time of salvation - "v'Avus Amim b'Api" (6).