Weren't these moments supposed to have banished to the past? Midway through the first half, panic and calamity arrived in Chelsea's defence and nobody could quite believe it.
In the early stages of this most unusual season, one question kept being asked about Chelsea – did they have the defensive gumption to marry up with their potentially thrilling attack?
Then Frank Lampard put Thiago Silva and Edouard Mendy in key positions and everything changed.
Silva's first taste of English football may have been the aberration at West Brom, when Chelsea conceded three goals in 27 madcap minutes, but since that day he has barely put an elegant foot wrong.