If Liverpool are to successfully defend their Premier League title, they will look back on the moment when Dominik Szoboszlai sank Arsenal with a late and showstopping free-kick as a foundation stone.
There had been little between these teams, the only ones with 100% records at kick-off; pragmatism held sway for long spells. Or maybe it was the fear of defeat. Nobody wanted to countenance that, however early in the season this fixture came.