It's not just the passing it's the first touch when receiving the ball and having so many options to choose from. Their movement at times was exceptional (at least 2 of the goals were pass and move at it's best).
There were very few slack passes and very few poor first touches. We on the other hand kept gifting them the ball.
Haper was one of the few players who wanted the ball (not that he always did a lot with it though), so credit where credits due. Sidders was missing, Long and Doyle didn't have much to play with up front, De La Cruz had a bit of a mare and Shorey was made to look a bit silly for the first time this season.
Anyhow, they probably won't play as well again this season, and we probably won't come up against anyone else who will play like that for a whole game (well except maybe Aresenal away!).