barry | harry. Don't make me say it There was another speedster. She was using that Velocity-9 stuff you and Caitlin came up with and never bothered to tell me about. She got addicted to it. And at the end, before the cellular degeneration caused her to disintegrate, it turned her lightning blue.
Which means Zoom was also using a form of Velocity and suffering from cellular degeneration. Which is why he wanted my speed.
And we all know speedsters, the really fast ones, can be in two places at once.