Bryan Bertino is a filmmaker who is adept at giving us a dizzying array of frights on the big screen. His stories and visual style tend to stick with you, and some things you just can’t unsee. In 2008, he shocked the horror world with The Strangers. Now fast-forward to this year at Fantastic Fest where we find him returning, somewhat, to a self-contained, claustrophobic and hostile setting. Vicious is definitely in the same vein. But it’s more apt to say it’s under your skin. The force in the story is not external; it’s already here, it’s on the inside, and it knows everything about you. Bertino’s film focuses on the…