Korey Smith was buried beneath his team-mates in one corner of the pitch while Bristol City’s young manager Lee Johnson sprinted down the opposite touchline, fists clenched in celebration, before hurling himself into the arms of his coaching staff. A relative sense of order was restored for the few moments that remained before referee Mike Dean started the pandemonium all over again. It took them another 20 minutes to clear the pitch of fans who could barely believe what they had just seen.