There are different ways to react to costing your team a victory. One is to post a meandering and tedious apology on social media two hours after full-time. Another is to make up for your mistake while you are still on the field.
Here in the city of his birth and against the team with whom he started his career, Kyle Walker chose the latter option.
His ill-advised back heel in his own penalty area with five minutes of normal time remaining looked as though it was to have calamitous consequences for a team of champions still deprived of the first hand services of Pep Guardiola.