I'm aware that the use of the past perfect tense usually implies a flashback or something similar when writing fiction. Does the entire flashback need to be in past perfect or can it just start out with it?
The tense in the flashback would need to be consistent with accordant timing. I’m not sure it’s necessary to use a sentence containing the past perfect tense and then go into a lot of detail; it may be more effective if you just start the flashback in whatever tense you choose to use in a new paragraph.
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