What are you...prepare(or preparing)...to do means "what are you going to do" or "what are you going to do"
It is said that it was in 1987 In the movie "The Untouchables", this is what Sean Connery said while pinching Kevin Costner before he died. What are you preparing to do?
This dialogue was intentional No subtitles are printed. The film company explained: "A Gui is the village master's apprentice. He followed the village master and his wife to move to the Pig Cage Walled City and decided to remain anonymous. Later, the Ax Gang attacked, and A Gui had no choice but to show his skills first. In fact, what he said when he was dying was It said "What are you preparing to do?" This sentence also caused the village owner and his wife to decide to return to the world to deal with the Ax Gang."