It was just one of those flukey plays.
Fortunately, X-rays came back negative, but Doncic is not returning to the game.
It will be tomorrow morning before Dallas knows the severity of the injury and how long Doncic will be out, how his ankle responds to a night of treatment will determine a lot. That said, he seemed to grab his high ankle while down, which is concerning.
In his second season, Doncic has exploded on the scene and played at an MVP level: 30.4 points, 9.9 rebounds, and 9.3 assists per game. He is, at age 20, as good as any pick-and-roll ball handler in the league, and is the engine for a Dallas offense that has been the best in the NBA this season. Dallas' offense is 6.1 points per 100 possessions better when he is on the court.
It goes without saying if he is out for an extended period that is terrible news for 17-7 Dallas, which currently sits third in the West.