"wicked fist." This shows that they fight viciously. "Fist" represents anger that is physically violent. (See: [[rc://en/ta/man/translate/figs-metonymy]])
Yahweh uses a question to scold the people. They act like they are humble before God, but they are hurting other people. AT: "This is not the kind of fast I want ... under himself." (See: [[rc://en/ta/man/translate/figs-rquestion]])
# A day for anybody to humble himself, for him to bow down his head like a reed
This means the person is bowing down, but he is not truly humble. "A reed" represents a weak plant that bends easily. (See: [[rc://en/ta/man/translate/figs-simile]])
# Do you really call this a fast, a day that pleases Yahweh?
Yahweh uses a question to scold the people. AT: "Surely you do not think this kind of fast pleases me!" (See: [[rc://en/ta/man/translate/figs-rquestion]])