How we cite our quotes: (Chapter. Paragraph)
Quote #7
"The brute! The brute!" I cried with clenched hands. "Oh Holmes, I shall never forgive myself for having left him to his fate."
"I am more to blame than you, Watson. In order to have my case well rounded and complete, I have thrown away the life of my client. It is the greatest blow which has befallen me in my career. But how could I know—how could I know—that he would risk his life alone upon the moor in the face of all my warnings?"
"That we should have heard his screams—my God, those screams!—and yet have been unable to save him! Where is this brute of a hound which drove him to his death? It may be lurking among these rocks at this instant. And Stapleton, where is he? He shall answer for this deed." (12.81-3)
Point made. Check out the difference between Holmes' and Watson's reactions to Sir Henry's supposed death. Holmes worries about the blow to his career. Watson's undone by the sound of those horrible screams. Both men's reactions intensify the action—someone is gonna pay for this.
Quote #8
But no slightest sign of [footsteps] ever met our eyes. If the earth told a true story, then Stapleton never reached that island of refuge towards which he struggled through the fog upon that last night. Somewhere in the heart of the great Grimpen Mire, down in the foul slime of the huge morass which had sucked him in, this cold and cruel-hearted man is forever buried. (14.80)
Conan Doyle chooses to punish Stapleton by sinking him into the same bog where he has been hiding the Hound. This does seem like a fitting end: on the day that Watson and Stapleton first meet, they watch a pony sink into the Grimpen Mire. Watson is struck by the fact that the pony's struggles "turned [him] cold with horror, but [his] companion [Stapleton's] nerves seemed to be stronger" (7.59). Stapleton's lack of empathy for the pony foreshadows early on that there's something morally wrong with him. And what goes around, comes around.