The perils of not taking your chances. Nicolas Jackson was not the only culprit at Selhurst Park, but Chelsea's striker will face the avoid the biggest chunk of the criticism.
He in particular had the opportunities to finish this game, to give the visitors an unattainable lead. Instead, they contrived to throw it away, making it four matches without a win.
Chelsea's opener was a splendid move. Jadon Sancho grew up in South London, a cage footballer whose creativity could not be contained, and perhaps it was that return to roots which brought out his best in that particular moment.