City are already 3-0 down from the first leg following their capitulation at Anfield last Wednesday. "It's the cool thing in the game, that it's still possible".
And with City's line-up packed with attacking players - although top scorer Sergio Aguero was on the bench - it came as no surprise that they flew out of the blocks.
"At halftime, we said if we scored a goal it would change the atmosphere", Klopp said.
"But I would be aggressive against them".
Barca fell behind in the sixth minute when Daniele De Rossi found Edin Dzeko for the striker to control the ball with one touch and finish with his second.
"It would have been different to go in 2-0". However, the City coach must have continued the verbal assault as he was sent to the stands for the second half. Liverpool's midfield options are lightened further with the news that Emre Can is set to miss the rest of the season with a back injury. Four years on, fans are still aggrieved that UEFA punished City for a bout of heavy spending to replenish the squad to enable the team to break into the European elite.
Both games saw the normally dominant City exposed and concede three goals in periods of less than 20 minutes.
"You won't find a team who can keep the same momentum over the course of 11 months", Guardiola said. "Maybe in the future, I will realize what the trick is".
However in just one week they've lost three times and added to earlier losses this season it means that they will "only" with the league and EFL Cup this season whilst even a record points total is under a bit of pressure.
The Reds are the highest scoring side in this season's Champions League campaign with 31, with Mohamed Salah grabbing eight of the impressive figure. Not once in the first half did they need to ask for it back, and along with a heavily-watered Etihad pitch, it contributed to a rapid pace that Liverpool simply could not handle.