Here "sword" represents the king's power in battle. To turn the sword back represents making the king unable to win in battle. (See: [[rc://en/ta/man/translate/figs-metonymy]] and [[rc://en/ta/man/translate/figs-idiom]])
Here "stand" represents being victorious in battle. Alternate translation: "You have not helped him to be victorious in battle" (See: [[rc://en/ta/man/translate/figs-metonymy]])