The word choice in paragraph 70 of "A Sound of Thunder," a short story by Ray Bradbury, gives the passage its ominous setting and tone.
The choice is to show Tyrannosaurus rex, the dinosaur, as a fierce warrior that has gaping mouth with a fence of teeth resembling daggers.
Using choice, the author made it clear that the hunters had non-existent chances to confront the dangerous, man-eating Tyrannosaurus rex.
Thus, the author's choice is to show how the effect of small actions in the past can ruin the future, thereby setting the tone in a very dangerous background.
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