Things can change quickly in football, hence the sight of a chap who won the Champions League for Chelsea just three and half years ago being booed here at Stamford Bridge.
Kai Havertz, who scored the winner against Manchester City in Porto in the 2021 final, has the temerity to play for Arsenal now.
Here at a rather rambunctious Stamford Bridge, Havertz left the field at full-time with a huge bandage covering a head wound. It was that kind of game. Competitive, intense, lacking long spells of quality and really rather rough and tough at times.