When the half-time whistle sounded, with Liverpool 4-0 up and everybody inside Old Trafford well aware that it could have been seven, the boos from the Manchester United fans rang out.
At half-time against Atalanta in the Champions League last Wednesday night, with United 2-0 down, there had been a volley of jeers before the support for the team and the manager, Ole Gunnar Solskjær, came through. United would rally to win 3-2.
