The initial concept for this short story came up when I was considering the claim that Tyrannosaurus rex would have used its size to bully smaller predators such as raptors away from their kills. This may have happened once in a while, but I would think that, if anything, the smaller predators would have been the ones who would eat T. Rex's leftovers. T. Rex's kills would have been bigger after all, so it could have fed more scavengers than anything raptors could kill.
As I wrote this, the story evolved into a deconstruction of the raptor fanboys' belief that a pack (or flock) of raptors would have been capable of killing anything. If larger raptors like Utahraptor or Achillobator hunted in groups, I could see those tackling large prey, but the likes of Velociraptor or Deinonychus tackling anything as big as a fully-grown T. Rex or Triceratops...please! You might as well have flocks of hawks attacking rhinos.
The way I see it, most raptor flocks would have stuck to medium-sized prey such as Tenontosaurus, leaving the really big and dangerous game to larger theropods like T. Rex and Acrocanthosaurus. It would have been rather like how wolf and hyena packs today hunt deer rather than elephants. I don't mean to this say that raptors weren't badass in their own way, but no dinosaur was an indestructible killing machine.