The fact that it is one of the most readily identifiable moments in sport tells us something about how we engage with all games. When Liverpool played Chelsea in April 2014, they were leading the Premier League by five points with three games remaining. If they avoided defeat, they would move into a position of huge strength, even if Manchester City, six points behind, had a game in hand. Just before half-time, Liverpool’s captain and local hero Steven Gerrard slipped, allowing Demba Ba to burst through and put Chelsea ahead. Gerrard would subsequently describe his feeling on the day as…