How does one define the end of a matter when there has never been a clear definition of what the matter is? How does one end something one does not wish to admit had ever begun?
He is no fool. He said he would know when their idyll ends. He will feel no pain. He knew instantly, from the moment he watched the flash between the eyes of Watson and Miss Morstan. He saw the inevitable end.
Why then, is he still here, staring at his friend's face, watching him sleep?
He's not an idiot. He knows when something ends.