Weak hands are a metonym for a person who is afraid. AT: "he is causing the soldiers and all the people in the city to lose courage" (See: [[rc://en/ta/man/translate/figs-metonymy]])
The hand is a metonym for the power that the hand has. AT: "you are able do whatever you want with him" (See: [[rc://en/ta/man/translate/figs-metonymy]])