A lightning user, certainly. Raiden's just disappointed because if the storm were real, Minoru would be in for one very impressive show. However, this is not the case and so he turns to his opponent, returning the bow and giving him a head start. There's plenty of insulating concrete and brick around, but aside from the cars and their rubber tires, not much is protected from a an electric charge.

He waits a moment, and then disappears in a flash of lightning, as a simulated strike hits nearby. He may not be an actual ninja, but in a storm he can be illusive. He holds out a moment on top of a low building nearby, and when another lightning bolt flashes, he appears behind wherever Minoru has dashed, looking for a haven in this wet scenario.