I'm not saying it didn't.
11 v 10 isn't impossible, Inter Milan did it very well. Arsenal obviously aren't as defensive as Inter but you can chalk that up to a flaw in Arsene's philosophy. The first half when it was 11 v 11, Barca dominated, Arsenal were no where in sight, for a team who are applauded for their passing, I don't think they strung 5 passes together.