The first scene starts outside of Lydia's house, a typical suburban McMansion with a few extras that show the Martins are doing more than well for themselves, including an in-ground pool and hot tub with expert landscaping. There's a party in full swing around the pool area, people are drinking, a few guys are pretending they're going to toss a girl in the pool and she's shrieking in mock-protest. Scout is sitting next to Stiles on the low wall separating the pool from the hot tub, dangling her bare feet into the pool-water and pretending she's not sneaking glances at Alan and Lydia, who are talking in low voices across the pool. Lydia gestures over towards where Scout and Stiles are sitting, making some kind of point, and Scout looks away again quickly. She says something to Stiles then gets up and heads into the house, clearly looking for some space.
The shot tightens, it's focused on her enough to hear her footfalls now instead of general party noise, and it follows her down the hall of the house, through a crowd of people, and into a sunroom that looks over the party outside. Matt Daehler is standing by one of the large windows, camera in hand, and he smiles when he sees her, setting it down on the end table next to him.
“Hey, it's the girl who ditched me on our date, sorry, hanging-out-as-friends session,” he says, tone fairly light. “I texted you,” she reminds him, “I felt sick and so Stiles drove-” “You home, yeah, I got the text. I hope you're feeling better now. I could have driven you too, you know. So what's the chance of us--”
He's cut off as a guy with the distinctive enthusiasm of the already inebriated suddenly pops halfway through the door, spots Matt, and grabs his arm.
“Guys! Guys I found someone to hold Todd's other leg for the keg stand!” he yells, dragging a protesting Matt out of the room as Scout hides a giggle behind her hand and motions for him to go, that she'll wait. She looks around the suddenly quiet room for a moment, fidgets with her ponytail a little, then her gaze falls on the camera Matt had put down on the table. She hesitates a moment, looking towards the door, then walks over and turns on the screen to look at the pictures stored on the memory card. The first one to pop up is the action of a lacrosse game, Alan twisting away from an opposing player, stick raised to throw a pass, and she smiles involuntarily, lingering for a moment before clicking to the next shot, the team celebrating after the game. She notices herself in the background of that one, leaning over to grab a stray helmet that's gone rolling away from the action, but doesn't seem to think anything of it, clicking to the next shot...which is a close-up of her, watching the practice. She raises her eyebrows slightly then tilts her head, evidently engaged in the universal practice of checking out the size of your nose in a photo when you have the chance to do it in private. She clicks to the next photo, another close up of her, in the hallway this time, looking away from her locker, and she frowns. The next is her again, laughing, shoving at someone she recognizes from the flannel as Stiles, but he's been cut out of the frame. She's clicking through faster now, eyes going from narrowed in concentration to wide with shock as she sees herself in shot after shot, mostly close-ups. In the parking lot of the veterinary clinic, at school, on the field...she freezes when she gets to one taken through her bedroom window. She's studying at her desk, head bent over her book. Her finger hovers over the arrow to click the next button-
“See anything you like?” She starts, almost dropping the camera, but manages to catch it. Pressing the “off” button before holding it out to Matt.
“Sorry, I shouldn't have, I'll just...” she starts to edge past Matt but he steps in front of her, holding his hands up when he sees her tense.
“Scout, wait, I mean, I'm thinking you saw those photos, right? Of you?” She nods slowly,
“Matt, some of those pictures, I mean, I don't know how you even took them...” He cuts her off, smiling a little and running his free hand through his hair, looking more rueful than psychotic.
“Oh come on. It's just a telephoto lens. Oldest photography trick in the book. Is it really so bad? That I think you're beautiful? That I think you should be the subject of a perfect photograph?” His voice is quiet, reasonable, and he's still smiling like this is all okay, a misunderstanding and her overreaction, and they'll clear it all up. Scout wraps her arms around herself but doesn't move to force her way past him.
“You still shouldn't... I mean technically it looks kind of...stalker-y?” her voice is quiet, like she's trying to soften the impact of her words, but Matt's face hardens anyway.
“Seriously? That's what you're going with Scout? That I'm a stalker?” He shakes his head, “Honestly? The reason I like you isn't just because you're beautiful, it's because you're a good person. I mean, I figured, okay, this girl is completely out of my league, she's gorgeous, her last boyfriend was some lacrosse guy, possibly the nicest girl in school... so I took a couple pictures of you. I thought you'd understand. I mean, Scout, even if you weren't...dating or not-dating, or whatever, Alan, would you have ever given me a second look?” She looks back at him uncertainly, opening her mouth and closing it again and he smiles, rueful and sad, “Yeah. That's what I figured. I've never so much as walked too close to you, much less hurt you. I just wanted to take a few pictures of something beautiful that I'll never have, and now you want to take that away from me too? Make me into one of those creeps who papers their bedroom with pictures of a girl and says things like,” he tucks his chin and deepens his voice into a bad impression of a stalker from a horror movie, “If I can't have her, no one can?” He shakes his head, “Because that's not me Scout. And acting like it is? Makes you kind of a bitch.”
She steps back in quick, uncoordinated motion, like she's been slapped, expression hovering somewhere between confusion and anger. Before it can resolve into something definitive, before she can say anything, she jerks her head towards the door, evidently having heard something. A moment later Stiles' voice sounds from the hallway, loud enough to be heard by those without werewolf senses,
“Scout? You in there? Lydia wants us try her punch like really badly so-” he stops when he gets to the doorway, eyes narrowing when he sees Matt and then takes in Scout's expression. He opens his mouth to say something else, takes another step into the room, but Scout hurries past Matt, grabbing her friend's arm and hauling him after her into the hallway, blurting,
“Sorry. I'm sorry,” over her shoulder to Matt as she goes. When she gets outside, she downs the entire cup of punch Lydia hands her in one gulp, then holds out her hand for another one.
The screen goes black for a moment. When the next scene starts, Scout is standing in an empty office at the Sheriff's station. Matt is standing across from her, pointing a gun at her. “I don't want to hurt you,” he's saying, “I don't want to hurt Stiles, or his dad, or your mom. I just want the book. I just-” he cuts off at the way Scout's looking at him, her hands clenching into fists and then unclenching again, eyeing the gun in his hand. He sighs and smiles, but the expression is cold. “But you don't care, do you? You don't care about what I told you, about what Lahey did to me, you don't care that they killed me. No. I'm the bad guy no matter what, right? Fine. I'll be the bad guy.”
Scout whirls around suddenly, bringing her arm up to block the kanima that's just appeared behind her. Her eyes go yellow as she swings out, aiming her claws at its face, but the lizard is faster and before she can so much as howl she's looking down at a cut on her arm. She jerks, a motion like she's trying to run even though she knows it's impossible, and then crumples to the floor.
“How does it feel? To have all that power taken away from you?” Matt's knelt down next to her and he pauses like he's waiting for an answer, then laughs, “Right, kanima's got your tongue. God, Scout, you have no idea how lucky you are. When most people get shot? They die. You'd just walk away...unless I do this...” he lifts the gun, presses the barrel directly to her forehead, “because I'm thinking even you won't walk away from that.”
On the floor, Scout's breathing has picked up, her eyes have gone wide, and some of the minor muscles in her face are twitching, but she's still paralyzed, the rest of her body completely still.
“You should have given me a chance, you know? Because maybe if you had, none of this would have had to happen...and because you know when I said I'm not one of those guys who would say something like, 'If I can't have her, no one can?' Well that's not...entirely true. Because Scout,” his voice drops, not just in depth, but all the showmanship, the sarcasm, it all drops away from his face and voice and as he speaks again it's stripped to a bare intensity, “if I can't have you, no one can.”
She sucks in a breath, his finger moves to the trigger...
...and then the Argents' smoke bombs crash through the window. The screen is obscured with smoke, then goes black.
TL;DR(because this is copy/pasted from a psl where we went in-depth for videos so longer than brief, way longer than brief) basically the Matt stuff that happens to Allison on the show, happens to Scout at the party and police station, with adjustments for timeline differences and what would actually hurt a werewolf as opposed to a human. Matt's a creep, boooo Matt.