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Basic Trope: A character who survives in the original work dies in the adaptation.
Straight: Bob survived in the original work, but gets killed by Emperor Evulz in the adaptation.
Exaggerated: In the beginning, Evulz kills Bob in a rather gruesome fashion.
Downplayed: Bob dies in the original work, but is killed sooner in the adaptation.
Justified: The adaptation includes a relatively small change that triggers a For Want of a Nail situation, where something that should have saved Bob in the original story is not present in this alternative reality.
The author decides that the original was too unrealistic and is editing out an Ass Pull in favor of Reality Ensues.
Lampshaded: Bob's last words to Emperor Evulz are: "How did you get there?"
Invoked: Evulz acts differently in earlier scenes, such as avoiding a mistake he made in the original. This results in him being more likely to kill Bob.
Exploited: The writer has Alice turns her friend's death into a call to arms for her fellow fighters.
Defied: Alice saves Bob just before Emperor Evulz attacks. This didn't happen in the original, if only because Evulz never got the chance to strike in the first place.
Discussed: Alice and her friends mourn Bob's death in a scene unique to the film, and talk about how unexpected his death was.
Conversed: A Genre Savvy character talks about how the film adaptations in his world "always kill off the best characters in the books".
Deconstructed: The plot change causes other changes in the storyline of a For Want of a Nail style. For instance, Bob's death traumatizes Alice and Evulz delivers a Breaking Speech on why he means serious business.
The For Want of a Nail effects are replaced by carefully arranged In Spite of a Nail influences to realign the plot back to the original. For instance, Alice continues her quest but with a new motivation to avenge her fallen friend.
Alternatively, Alice comes to terms with the death and becomes a better character for it.