Agreed. How much space did he have ?
I know Enrique lost Hernandez which is the real error but I don't know what Lucas and Gerrard were doing, they both were past the near post and seemed to try and swap as the corner was taken.
I'd like us to try the way United attacked that corner though. Having 3 big players lining up at the edge of the box(towards the far post) is a big distraction to the defenders and if the opposition go man to man the defenders end up running towards their own goal where it's easy for them to get blocked off and lose their man and difficult to clear if they do get to the ball first.

...............typing on a tablet and predictive keyboard, its meant to be clever!