Look closely under West Ham’s fingernails and you’ll find traces of Arsenal’s skin.
Such was the ferocity of the home side’s fightback nobody at the London Stadium - or watching at home - could be in any doubt about the players’ commitment to the cause. Or to David Moyes.
The Hammers clung on for dear life as Arsenal threatened to run away with it. Then a single moment sparked the epic comeback that could easily have ended with a shock Hammers win.