The four-time all-star point guard, who came over from the Celtics in a mid-season trade, was likely seen as having quit on his team.
The pair had a heated dispute during a game, which then continued in the locker room.
Dallas, with an eye on competing for the 2015 NBA title, makes a big upgrade at point guard.
Then the point guard played in the game, which was nearly as surprising.
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After a tussling with Kris Humphries, Rajon Rondo reportedly tells his side of the story to the NBA while Kevin Garnett rips Humphreys and defense Rond.
The Nets aren't backing down from a fight while Doc Rivers says the Celtics are soft.