All teams who are 'good at defending' concede some chances, & occasionally it's down to shit mistakes, even in the 'best' defensive teams.
That was the case last night. We dropped some right bollocks.
The best defensive teams usually have a combination of luck & dogged determination, which covers said fuck ups. That was us last night.
We weren't that, v Celtic, Leicester etc, a couple of years ago, nor at Anfield last season, we were a bunch of clueless shithouses who helped the opponents to score, by compounding one mistake after another.
Imo, we have gradually evolved into a team which can be dogged, as well as pressing, wheras Pep's Barca were more reliant on shit or bust, in the pressing department.
It's no accident imo. Pep has learned stuff, from the Prem, as he does everywhere.