"If I can definitely destroy you, I will gladly welcome death for the sake of the public interest!"
Holmes is too strong, and he chased Professor Moriarty until there was almost no way out. When, caused Professor Moriarty's counterattack. Moriarty is also very strong, and he is also a desperado. If he does not completely eliminate Holmes, he will also die. So he tracked Holmes all the way to his apartment and threatened him. Holmes was indeed shocked at the time, but he was also calm and said this classic sentence. Later, Holmes took refuge in Watson's house and worked with Watson to evade tracking and close the bandit net. Finally the remaining culprits were cleared away.
But it was also found by Moriarty and his remnant soldiers. Holmes knew that it was a complete set but still sent Watson away for the final battle at Reichenbach Falls. Both fell off the cliff... As mentioned above... Regarding this ending The reader was very dissatisfied (I was so angry anyway 222···), so Conan Doyle resurrected him in later chapters o(∩_∩)o...haha