By Michael O’Sullivan, The Washington Post John Wick, as fans of the eponymous 2014 hit about a ruthlessly efficient assassin already know, once killed three people in a bar, using only a pencil. That legend gets repeated in the new, deliciously stylish and hyperviolent sequel to the live-action comic book, “John Wick: Chapter 2” — but with a twist. If anything, the legend has probably been “watered down” from reality, as one bad guy ruefully notes.