Sanchez (not Ozil) is Arsenal's attacking engine

You could learn much about Alexis Sanchez and Mesut Ozil simply be watching their respective reactions to being substituted here at the same point of the second half.

Ozil willingly came off straight after a quiet game, whereas Sanchez looked like a man who had been grossly insulted.

It was not a major meltdown but, equally, his dissatisfaction was hardly concealed. His sweat-band was volleyed in the direction of the dugout and then his coat had to be placed over him as he sat with his head down.