i think it was more of a visionmental lapse on the referee ' s point of view . usually , the ref that is closer to certain players closely monitors the call while the other faraway two are just ' backup ' or also monitoring their respective area of point of view . in this nick young ' s case , the ref that was close seeing the action was behind brandon ingram . now imagine yourself on that point of view . the ref would see brandon dribbling and was trying to shakeoff his defender by spinning . after spinning , he then passed the ball intended to lou williams and the referee maybe was looking at it . but then boom , he saw nick stole the ball and things maybe too fast for him to recognize what happen that he did not saw nick ' s foot and just look at the ball or the three point line . things happen but if you watch clearly the replay , it really was a travel .