User blog comment:SuperStrawHatSaiyan/Are You Gonna Fix It, Toei?/@comment-972068-20130105043951/@comment-2252393-20130105181808

Well, when you go back to read the manga, as you see Luffy preparing to smash the Pacifista with his fist, his arm stretches and the only steam being emitted is from his arm, nowhere else, so it's safe to say Luffy is SUPPOSED to use single-limbed activision.