Final answer:
The narrator's tone in the described excerpt is best characterized as horrified, emphasizing the emotional impact of the suffering observed.
Step-by-step explanation:
The narrator's tone in the excerpt can best be described as horrified. The passage recounts moments of intense human suffering and tragedy, with descriptions of the emotional anguish experienced by individuals in the face of death and disaster. Words like 'shrieks', 'dearest relations', 'dying', and 'stoutest heart' convey a deep sense of horror and empathy towards the victims, without expressing a direct sense of anger, disgust, or personal bitterness towards any particular cause or entity.