A blot on his name
Westwood says that he has a "blot" on his name, which is a metaphor as he does not literally have a blot on his name. This metaphor is used to show how the trial has damaged Westwood's reputation and has forever changed people's opinions of him within the community.
Like a feeble old man
Sergeant uses a simile to describe how Sydney's brother had "looked for the first time like a feeble old man" when he heard the news of his brother's death. This simile is used to emphasize how devastated he was and how this manifested itself in his physical appearance.
The death of Sydney Vane
The death of Sydney Vane is described as having a terrible impact on his home and family. This is described with a metaphor, which suggests that the lights of the home have metaphorically gone out:
"It seemed almost incredible that so great a misfortune should have fallen upon the house, that its brightness should be quenched so utterly."
Hubert's blush
Sergeant uses a metaphor to describe Hubert's physical reaction of shock: "A flush of dull red color stole into the young man's face." Describing it as a "flush of dull red color," visually reflects his mood.
Flaming eyes
The General is described as having eyes that "flamed with the look of an infuriated beast of prey." This metaphor emphasizes his intense anger, triggered by the injustice of Sydney's murder.