Manchester City were so much more influential after half-time last week and that was because of Pep Guardiola's tactical tweaks.
In the first half, City's wingers, Phil Foden and Riyad Mahrez, were so wide that they probably walked in with white chalk on their boots. This in turn saw the full backs, Joao Cancelo and Kyle Walker, sitting further back than usual, as protection in case of any Paris Saint-Germain counter-attacks.
It was overly cautious, and that isn't a characteristic we'd associate with Guardiola. But it changed in the second half.