I think one of the things which can get lost in all these tactical discussions is that the shape of a system often changes on transitions from possession to loss of possession. What cost us the most dearly at Old Trafford, was that the pressing game we have been so good at aggressively implementing was absolutely non-existent. We played that first-half looking like we did against the spammers on Lasagnegate. I cannot remember a match since November where we have allowed so much space for the opposition midfield to operate, and we were generally playing so deep that Eriksen and Kane were thoroughly isolated. It was really strange. When we play the pressing game, it is always clear tome that the moment possession is lost, we quickly become an aggressive 4-5-1 (or if you want to boil that egg, 4-6-0!) because we drop into the spaces and 'swarm' the player in possession PLUS their potential passing lanes. It's a shame we were asleep Sunday as I think Mata was there for the taking and Carrick, however good he is, could've been snuffed out easily.