Ignores a lightsaber hit to the forearm

Just long enough to glimpse Chatak, all grace and speed, working her way into her opponent's space. Her moves were broad and circular, and the lightsaber seemed an extension of her. Vader, by contrast, was clumsy, and his strikes were mostly vertical. He was, however, a full head taller than Chatak and incredibly powerful. At various times his stances and techniques mimicked those of Ataro and Soresu, but Vader appeared to lack a style of his own, and executed his moves stiffly. With a whirling motion Chatak got far enough inside Vader's long reach to inflict a forearm wound. But Vader scarcely reacted to the hit, and instead of seeing cauterized flesh Shryne saw sparks and smoke fountain through Vader's slashed glove. Then he lost sight of them again.

Dark Lord: The Rise of Darth Vader, Part II, Page 73