Meh, Duran partied his face off after the first fight and gained over 25lbs in a couple months, some people said 50lbs
He thought that Ray Leonard won this one, there is no point for him to try in his current condition and that he would prepare for a rubber match
Ray Leonard said he knew about Duran’s weight and partying which is why he called for an immediate rematch, the rubber match never materialized in that sense, when they finally met they were both well beyond their primes in 89, Duran’s career started 21 years prior.
So this isn’t a “quitting” in the normal sense we are used to, it’s not like he was scared of Ray Leonard or was getting hurt, he just thought he lost the fight and didnt see a point to continue with a rematch in mind
Duran also went on to fight until 2001, fighting killers all along the way