The moment where it all changed for Chelsea

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?
Maybe Arsenal fans did — but only because they were having a good chuckle at the fate of Cesc Fabregas as he trudged off the field, long-faced and frustrated as jeers rang around the ground.