Present
Classic Sherlock. The murder was taking so long to solve, and the chair John was currently inhabiting so comfortable, that he leaned backwards. His head hit the back of the cushion, and his eyes fell shut.
Flux
He seemed to be falling, dreamlike, and he didn't jerk awake but instead kept tumbling through darkness, and he landed with a dull thud. He heard Sherlock saying, "John" in a voice that was close to heartbreaking, but when he rolled over, Moriarty was standing over him with a gun to Sherlock's temple. He reached up a hand to meet Sherlock's, but the image rippled like water and disappeared. The weight of the dog tags on his neck, suddenly, was familiar. He slipped farther into sleep.