Radak: Kel answers, I stomped by Myself. When one stomps grapes, they are minced and crushed. The verse depicts Resha'im as if they are grapes in the winepress, and Kel stomps them. He is alone - there is no merit of Yisrael to 'help' Him.

Malbim: One who stomps grapes, his purpose is to remove the wine. So He stomped them so they would repent.

Rashi: No one stands in front of Me to fight.

Radak: No one of the nations 'helps' Me take vengeance from Yisrael's enemies. All of them were their enemies; I will take vengeance from all of them.

Malbim: They did not want to repent to Me.

Radak: They harmed Yisrael who were exiled among them. "Ani Katzafti Me'at v'Hemah Azru l'Ra'ah" (Zecharyah 1:15).

Malbim: They did not repent. Af is external anger; Chemah is inner anger stored in the heart. My external anger and punishment was to remove the grape peels and pits, and extract the wine (remove the Resha'im). Since they did not repent, My inner anger flared, and I will trample them destructively.

Rashi: Their blood, which is the strength and Nitzachon (success) of man.

Radak: Their blood, which is man's life and strength. It splashed on My garments, therefore they are red.

Rashi: This is [becoming sullied ¹ ,] like "Nig'alu ba'Dam" (Eichah 4:14). Radak - this is like Hig'alti. The Aleph is in place of the Hei. Also "Eschaber Yehoshafat" (Divrei ha'Yamim II, 20:35) is like Hischaber.