I loved the way he would roll jabs and counter with an overhand right. He hurt Leonard badly in the Brawl doing this, landed some sweet ones on Barkley and off the top of my head I think it was the same move that started an onslaught that got a running Lou Bizzaro out of there. He was also great at pulling back from punches while on the inside as well. Duran had a great sense of ruthless economy in the way he fought. Like everyone has pointed out, even though he was a great brawler at heart he was still a trained boxer. He also knew what rythym to fight at. At Lightweight he was a manic ball of energy but as he went up in weight he had the savvy and wits to know that he would have to rely more on boxing, pacing his rounds and looking for an oppurtunity to unleash rather than just trying to force his will against bigger stronger opponents.