Following Harry meant watching him as he moved, and he moved like the world stood still around him, and how could they have missed this? How long had he been like this?

Barry couldn't quite stop running his tongue over his fangs, testing their sharpness, the unfamiliar shape in his mouth, but he paused as Harry opened the Pipeline. "What I need is in the Pipeline?" he asked with a little prickle of wariness. "Why?"