Anthony Martial, the world’s most expensive teenager, conjured up images of Thierry Henry as Manchester United’s newest savior dribbled at three Liverpool defenders and ended his daring run by slotting the ball past Simon Mignolet. It was exactly the type of speed, skill and creativity that United has been lacking. And now you know why Louis van Gaal spent $55 million for the French striker two weeks ago. “A lot of players have made a debut and scored with me so it’s a good signal,” Van Gaal, the United manager said following a 3-1 win at Old Trafford on Saturday. “‘We scouted him and we wanted him because he’s the best in his age, but he needs time and three days is too short to judge his personality.” With the departures of Robin van Persie, Radamel Falcao and Javier Hernandez, Van Gaal made a big splash during the September transfer window by signing Martial from Monaco where he scored 11 goals in 49 appearances for the French club. Van Gaal was ridiculed for spending that much money on an unproven teenager but the manager insisted that the move was made with an eye on the future. That moment arrived sooner…