Johnny O’Bryant scored 12 of his 18 points in the second half and grabbed 11 rebounds, helping LSU pull away for a 70-54 victory over Arkansas in the opening game of the Southeastern Conference tournament on Thursday. Storm Warren scored 14 for LSU (18-13), which had ended its regular season with a three-game skid but rediscovered its offense in time to open the postseason with a convincing victory.