Celtics head coach Joe Mazzulla explained a now-viral clip of him yelling at an injured Jayson Tatum during Boston's Game 1 win over Orlando.

The Boston Celtics had to hold their breath late in the first game of their series against the Magic after Jayson Tatum was fouled and he came up holding his wrist. After Tatum was fouled, the play was reviewed to see if it was a flagrant foul.

While the Celtics' roster deserves most of the credit for their success, it doesn't hurt to have a coach like Joe Mazzulla patrolling the sideline. Late in Sunday's win, Mazzulla went viral for his reaction to Jayson Tatum's apparent right wrist injury.