It’s really bugging me that we haven’t yet settled on what genre our psycho killer belongs to. Is this a vengeful spirit? A particularly motivated and resourceful crazy person (or persons) like in Scream? A supernaturally strong (and possibly mortal-ish) killer like Jason? In some scenes we’ve got people wearing masks but in other scenes we’ve got supernatural stuff (like the girl that Rutskarn pointed out) and I have no idea where the story is going.
Note that I’m not asking you to tell me in the comments. I’m saying at this point in the story I’d like to know what sorts of disbelief I should start suspending.
In general I find ghosts, spooks, and monsters much more interesting for these kinds of stories. Enabling a mortal to pick off a large group like this usually forces the writer to cheat their ass off and make the baddie omniscient, insanely lucky, and hyper-capable. The longer the spree goes on the less I can believe in the story. Meanwhile, ghosts and monsters can do whatever the author says they can do. They don’t need to spend six consecutive hours crouching in a crawlspace while their rubber mask fills with sweat, waiting for the exact moment when the right person enters the room without turning on the light so they can be properly jump-scared.
EDIT: And yes I realize this is totally the wrong mindset for this genre. Sorry. I literally can’t help thinking about this stuff when examining a story. It’s completely involuntary, and probably explains why I enjoy Japanese horror but have such a hard time liking American stuff.