UEFA Champions League
I don't think Barca was disengaged, but sometimes when you come in with confidence it can creep into over-confidence, and once doubt creeps in.....
Still, Barca had plenty of possession and plenty of decent shots. Once it was 3-2, though, they just fell apart. I don't care how great people think Messi is, you can't keep giving away games in the Champions League like this without it sticking.