NASCAR senior vice president of competition Elton Sawyer said that the decision to penalize Christopher Bell for riding the wall on the final lap of Sunday’s Xfinity 500 at Martinsville Speedway was “pretty straightforward” in accordance with the rulebook. “Obviously, we look at all the video,” Sawyer said. “As I back up on that and you go back two years ago when we had the situation with Ross [Chastain] here, we went to Phoenix, there was a lot of dialogue with the drivers that that’s not a move that we wanna have to make on the last lap. We were able to make it through Phoenix and had a grea…