Eden Hazard collected the ball on the right corner of the West Brom penalty area. He turned, came inside, got it on his favoured left foot and hit a low near post shot of such ferocity and precision that goalkeeper Ben Foster might as well have bought a ticket for all the influence he could have on it.
And right there, is the Chelsea conundrum. How is the manager of such a sublimely talented team ever in trouble? How does a player as gifted as Hazard ever have an off month, or even, famously, an off season?