Moriarty: This is a life-and-death duel, Mr. Holmes. You want to put me in the dock, I tell you, I will never stand in the dock. You want to beat me, I'm telling you, you can never beat me. If you have enough wisdom to destroy me, please rest assured that you will die with me. "

Holmes: "I've come to thank you. I tell you, if I can guarantee to destroy you, then for the benefit of society, even if I die with you, I am willing. "

Moriarty: "I promised to die with you, but you didn't destroy me." ..... It can be seen from this passage that this will be a life-and-death duel that will hinder life and the interests of the whole society.