Vader surprises Ferus Olin with his speed

"He is a former associate, yes, but --"

It happened before he could get out another word. Faster than an eyeblink. Faster than he'd seen anyone move, anyone except Yoda.

The lightsaber hadn't been there, and then it was, and the lightsaber was a blur. Vader moved without seeming to move, and the lightsaber sliced into Roan, straight into his chest. Straight into his heart.