Here "hand" refers to power of the enemies to hurt Israel. Alternate translation: "the power of their enemies" (See: [[rc://en/ta/man/translate/figs-metonymy]])
The sound made by a person who suffers is used to describe the pain of the Israelites as they suffer. Alternate translation: "as they suffered" (See: [[rc://en/ta/man/translate/figs-metonymy]])