De Gea saved them today but just like against Spurs, United won another big game because of the opposing team's mistakes. Can't win if they don't make them (e.g. vs Liverpool and us).
On the other hand, Arsenal are complete idiots. 30 minutes to go, only one goal in it and they decided to go full on gung-ho and leave themselves open to be countered. The decision to put 4-5 players in the striker's position was a farce as well. So many players forward but all did nothing. No variation, no nothing. All just stood in straight line.