“Enzo, Enzo, Enzo, in your head” was how delirious Manchester City fans regaled Enzo Fernández who after a star role in a memorable victory surely has instant cult hero status. This 199th derby was won by Erling Haaland’s ninth strike in the fixture but the visitors’ totem was their new No 17. He was the key nuisance in a goal initially ruled out for offside and which video assistant referee overturned when ruling Fernández was not distracting Lisandro Martínez when Josko Gvardiol’s ball came o…