Final answer:
The repetition of the phrase 'Fate' in this context suggests that the twins were warning others about the impending murder.
Step-by-step explanation:
In the context given, the repetition of the phrase 'Fate' does not imply that the twins were proud of their murderous intentions, seeking help to prevent the murder, or trying to justify their actions. Instead, it suggests that the twins were warning others about the impending murder. Despite repeatedly informing people about their intentions, no one took any action to intervene, indicating that the murder was not a secret.