Speaking as a future DRK, who wanted the job as a a dps. The name i feel dictates the role, a Dark Knight wears heavy armor. It only makes sense that a Knight fits the role of tank. That being said a Samurai (to serve), for whom all can agree was first and foremost honor bound, would NEVER attack an enemy from behind. Honor kept them using the sword after guns were introduced to their lands. Honor demanded their lives should they break the Bushido code, and facing an enemy Honorably was the greatest service, duty, any Samurai could want. To attack from behind, to conduct ones self dishonorably was not a true Samurai's way.