NBA legend Don Nelson wears Luka Doncic shoes to protest 'tremendous mistake' by Mavericks

Nelson, who has been living in Hawaii since being away from the game, carried a message with him for the franchise he used to lead on the court. 

Nelson is a part of a mass group that believes Harrison made the wrong move in trading Doncic to Los Angeles, which was one of the most shocking trades in recent memory anywhere in professional sports. 

Mavericks fans let Harrison know it, too, as chants filled stadiums home and away, while a group of fans even held a fake funeral outside American Airlines Center days after the deal went down in February. 

Dallas, though, may have gotten bailed out after the NBA Draft Lottery saw them win the No. 1 overall pick. The Mavericks will presumably take Duke's Cooper Flagg later this month. 

Still, Mavericks fans weren't happy to see Doncic, who helped lead the team to the NBA Finals last year, moving out west. 

While the Lakers didn't make a deep NBA Playoffs run, Doncic had similar numbers with the Lakers compared to the Mavericks. He averaged 28.2 points per game (28.1 in Dallas) with 8.1 rebounds and 7.5 assists per game over 28 contests. 

Nelson and many others have their opinions, but what's done is done now for the Mavericks. Time will tell who exactly won the trade. 

Nelson is a Hall of Famer coach, and one of the best in league history with San Antonio Spurs legend Gregg Popovich being the only one with more coaching wins all-time. He had 1,335 regular-season wins and 75 more in the playoffs during his time coaching the Milwaukee Bucks (1976-87), Golden State Warriors (1988-94), New York Knicks (1995-96), Mavericks (1997-2005), and Warriors once more from 2006-10.