Oklahoma City Thunder forward Kevin Durant (35) receives a police escort after being ejected from the game against the Dallas Mavericks in the fourth quarter during Game 4 of the NBA first round playoffs at the American Airlines Center in Dallas, Saturday, April 23, 2016. (Tom Fox/The Dallas Morning News)(The Dallas Morning News)

The game was essentially over. The last 90 seconds were just a formality.

But as Justin Anderson grabbed a rebound and went up for a put-back, Kevin Durant fouled him. Hard. So hard that it warranted a review by the officials, who deemed it worthy of a flagrant 2.

Here are the NBA guidelines that define flagrant fouls.

NBA flagrant foul rules indicate Durant could be out for Game 5, pending league office review. pic.twitter.com/gai5djVvzU

If the NBA league office determines Durant’s foul was excessive, or if he was not making a legitimate basketball play, there is a chance he could be suspended for Game 5 on Monday.

Dallas trails the series 3-1 and would be eliminated with another loss.