Vampire blood did different things to different people, his clinical scientist's mind told him. It depended on the health status of the human, the circumstances, there were dozens of factors. It looked like the Speed Force was one of the factors that hadn't been calculated yet.

Barry ducked his head after the wrist and licked it once more before falling forward, rolling onto his back with his arms spread as if he was going to make a snow angel right on the Cortex floor. More like a blood angel, he thought giddily as he grinned and started laughing, fledgling fangs gleaming in the overhead lights.