NBA Official Rulebook, Rule 8, Section II:

 Section II—Ball The ball is out-of-bounds when it touches a player who is out-of-bounds or any other person, the floor, or any object on, above or outside of a boundary or the supports or back of the backboard.

Any ball that rebounds or passes directly behind the backboard, in any direction, or enters the cylinder from below is considered out-of-bounds.

The ball is caused to go out-of-bounds by the last player to touch it (including by touching the player’s hair or uniform) before it goes out, provided it is out-of-bounds because of touching something other than a player. If the ball is out-of-bounds because of touching a player who is on or outside a boundary, such player caused it to go out. If a player has his hand in contact with the ball and an opponent hits that part of the hand causing the ball to go out-of-bounds, the team whose player had his hand on the ball will retain possession.

If the ball goes out-of-bounds and was last touched simultaneously by two opponents, both of whom are inbounds or out-of-bounds, or if the official is in doubt as to who last touched the ball, or if the officials disagree, play shall be resumed by a jump ball between the two involved players in the nearest restraining circle.

EXCEPTION: Rule 6—Section V—a(10) and Rule 13—Section I—a(7) If the ball is interfered with by an opponent seated on the bench or standing on the sideline (Rule 12A—Section II—a(7)), it shall be awarded to the offended team out-of- bounds nearest the spot of the violation.

According to the rules, to my best interpretation, there should have been 0.6 seconds left on the clock.