This is an example of a Defensive 3 Seconds Violation. The highlighted defender on this play appears to move to double team the offensive player, but he does not legally achieve this position, as he aligns hilmself directly behind his defensive teammate. A defensive player is not considered to be actively guarding an opponent when he is positioned directly behind a teammate – even if he is within arm’s length. Defensive 3 Seconds is called when the defensive player, who is positioned inside the 16 foot key area and not actively guard the offensive player with the ball, does not either actively guard an opponent or exit the lane within three seconds.