Watching Stephen Soderbergh’s Unsane is like being locked in a circus cage with a tiger. The camera — specifically Soderbergh’s iPhone camera — is loose-limbed, prowling, restless. The actors’ distorted faces and hands aggressively poke at your eyes. His leading lady Claire Foy, playing a nervous bank employee named Sawyer Valentini, talks fast and walks faster, high heels clawing furiously down the sidewalk while Soderbergh shoots her through bushes and trees. She looks hunted.