Violet prefers to fight with bullets than knives or potions. Simple, quick, effective at a distance. (Certainly more effective than arrows anyway, and hadn't that been an awful experiment?) Far be it for her to be prejudiced, but she's never been able to stand slayers of any sort. (As long as there have been werewolves, vampires and healers - witch is such a juvenile term - there have been slayers.) All that Siger's death achieved was exacerbating Violet's hatred for slaughterers, especially now when her son has become a prime target for them. So of course Violet is part of the counter-offensive tonight. (And those slayers better hope that they haven't harmed a hair on her boys' heads, or she's going to turn absolutely monstrous.)
She senses the change in the cool night air, feels the slayer approaching before he comes into view, uninjured, so unlikely he's met any of the others. (She's more relieved about that than she'd ever say.) He creeps along the darkness in the distance, as if the shadows are enough to protect him when the city is waiting for this. (Amateur.) Checking the silencer, Violet allows him to come well into range – timing and estimating carefully - before taking a breath, aiming and firing. He goes down without as much as a whimper, her bullet lodged between his eyes.
Violet breathes a sigh of a relief, and puts the rifle down. She'll sense when another target comes along. Now, she looks up at the stars, at the distant clouds that promise snow, and feels for the first time the cold bite to the night air. Age is creeping up on her, and tonight she knows it, but she's still got this mission left in her, because so help her if she didn't fight tonight and her sons were killed. (No guarantee that it won't happen, but at least she's part of it. At least she can take the pressure off them somewhat, give them a better chance to make it.) Not for the first time on this long night, she remembers Siger – so pale and broken – laid out in his coffin, and Sherlock's overdose only a couple of years later, and knows that whatever else happens in this early morning, she can kill some of those monsters who've tried to tear her family apart.