I'm not sure Barcelona lost this match because however they could have pressed better and forced Sakhtar's defenders to make mistakes. Barcelona must avoid defeat and maintain their best form, but to be honest this is a difficult match and makes the players feel frustrated. There's still time and I'm sure the equalizer will come soon.
And Shakhtar still beat Barcelona, a sensational defeat. I don’t know if this will allow Shakhtar to have any chance of leaving the group, Porto will most likely be able to beat Antwerp and also gain 9 points. Of course, Shakhtar will still retain a theoretical chance of reaching the playoffs, but even EL would not be a bad option for them.