In an age in which every man and his dog have their two cents on the performances of professional sportspeople within seconds of the action, fans can easily panic.
A weak header from Dejan Lovren followed by a slow reaction to clear the ball by new signing Alberto Moreno let in Stevan Jovetic to pounce and strike past Simon Mignolet.
Liverpool's back line looked disjointed for the second—Samir Nasri getting in behind the defence to play the ball into an unmarked Jovetic.
Sergio Aguero had been on the pitch for just 23 seconds when he nipped in behind Lovren, running onto Jesus Navas' through ball and comfortably beating Mignolet at his near post.
Jamie Carragher of Sky Sports was critical of Lovren:
He didn’t play well.
The whole back four never really functioned well and there were problems down that side with Moreno coming in for his first game. He has had a difficult night with Moreno on that side.
Is it a one-off tonight in terms of the positions they’ve taken up or is it something that Lovren does a lot? They have got to come over and fill the space.
Of course, there were plenty of holes to pick in Liverpool's performance at the Etihad Stadium on Monday and problems absorbing new players into the team, but the opponents and the context of the result should not be taken out of hand.
Man City were always going to be tough opposition—they pipped the Reds to the title last season and have strengthened since. Losing 3-1 in their backyard isn't ideal, but it's not unexpected.
In fact, from Liverpool's opening two games, the Reds are three points better off than they were in the corresponding fixtures last season.
Less than a week remains in the summer transfer window, and Liverpool will probably think they've got most of their work done.
In what has arguably been the club's best transfer window ever, Luis Suarez's departure to Barcelona has seen no fewer than nine players signed, bringing with them a mixture of youth, experience and world-class talent.
But off the back of the defeat to Man City, Liverpool must avoid throwing cash at solutions to problems that may be more easily fixed.
There's still scope for a back-up goalkeeper and a defensive midfielder to be brought in, but if the perfect players aren't out there, it's not worth bringing in second-best options.
Liverpool are an ongoing project. Coming anywhere near the dizzy heights last season brought while restructuring the team and introducing a new-look defence will be a remarkable feat—and certainly not out of the question.