The moment where it all changed for Chelsea

It’s the 55th minute at the Emirates Stadium on Saturday, September 24, 2016, Arsenal are leading Chelsea 3-0 and the title is about to be decided.

Did anyone inside the stadium notice? Did supporters, journalists or television pundits give more than a fleeting glance to the arrival of Marcos Alonso, who was making his league debut after signing from Fiorentina for €28m?