The scenario described sounds like a plot for a horror movie or book. The story is set at the end of summer camp, where teenage counselors decide to have a party to celebrate. However, things take a turn for the worse when they are hunted by blood-drenched locals and something far more sinister.

As the night progresses, the teens' party plans unravel into an unpredictable night of horror. They are faced with life-or-death decisions, and relationships are built or broken under the strain of unimaginable choices. The once-friendly banter and flirtations between the teens are replaced with fear and desperation as they try to survive the horrors that surround them.

The setting of Hackett's Quarry adds to the eerie and foreboding atmosphere of the story. The quarry could be a place with a dark history or secrets, and the blood-drenched locals could be the descendants of those who once worked there. The "something far more sinister" could be supernatural or otherworldly, adding a layer of terror to the already horrific situation.

Overall, the scenario presented in the description is an intriguing and suspenseful plot for a horror story or movie, full of twists and unexpected turns that keep the audience on the edge of their seats.