It was the most extraordinary moment of this Premier League season. If it eventually secures Liverpool a place in next season’s Champions League, it will be the most sensational goal in England’s top flight since Sergio Aguero’s title winner in 2012. There is something objectively joyous about a goalkeeper scoring. You see them lumbering forward, out of place like a punk dancing on stage at The Royal Ballet. You tell yourself that it probably won’t happen; they rarely practice this and they are there to cause a nuisance more than to score. But you know it just might.