The quick diagonal through ball over the top – or as all Fifa players will know it, left bumper and Y – is becoming an increasingly integral part of Arsenal’s armoury. They used it less and less over the course of this game, as Watford dropped deeper to counter the threat, but it was a serial tactic in the early stages, and more than once could easily have led to a shot on goal. And with Theo Walcott up front, along with Sanchez, Bellerin and Monreal tearing up the flanks, there are now four potential outlets for the quick diagonal. It will become an increasingly potent weapon against opponents who try to block up the centre.