The guy who directed Obsession made his previous movie for $800 and released it on YouTube for free. Curry Barker spent years making horror for an audience that watches with a thumb on the pause button. YouTube viewers scrub frame by frame, turn up the brightness, screenshot anything strange, and post what they find. So when he got $750,000 to make a real film, he kept composing shots for that audience. Details buried in shadow that only surface when someone goes digging. Traditional…