Sealed inside a locked Los Angeles sound stage, clad head to toe in motion-capture equipment that tracks every muscle he moves, Nolan North senses that something is wrong. He’s just completed two takes of a 30-second scene, which PlayStation 4 players will see in six months or so as an in-game cinematic at the end of an action sequence in Uncharted 4: A Thief’s End, one of 2016’s most anticipated titles. The script calls for North and Uncharted costar Emily Rose to walk up to the edge of an invisible cliff, point to an unseen endangered ally below, and head off to help him. Both actors hit their marks, deliver their lines, and splay their arms out to their sides in response to the director’s instruction to enter “Z-pose,” a tai chi–style stance that the actors adopt after every take as operators reset the mocap system. But the scene still isn’t working.