Following the own goal by Lisandro Martinez, it was flagged that the Premier League leaders had won each of their 24 games, in all competitions this season, when they had opened the scoring.
However, Bryan Mbeumo soon levelled and the title-chasing Gunners were clearly rocked by the calibre of the Reds' response to going behind in extremely unfortunate circumstances.
Patrick Chinazaekpere Dorgu's strike for the ages, that thundered in off the underside of the bar, came during the period of a match when Arsenal tend to dominate in terms of the goalscoring.
When Mikel Merino scrambled an equaliser, with six minutes of normal time remaining, the momentum was expected to shift in the hosts' favour.