Look at Ferran's 1st goal, what Lewandowski does at that moment. He ties up 2 defenders and additionally pushes one of them towards the goal to eliminate offside.
And Ferran - big applause for him for this match, good effectiveness, good entry. I think that in many matches they should play together with Lewandowski in attack, because Lewandowski will focus the defenders' attention on himself and thanks to that Ferran will be able to shoot.
In general, until the 72nd minute it seemed that Barcelona would not do much. Lewandowski's goal gave the whole team a boost. Neither he nor the team even celebrated this goal. A quick return to the center and then everyone got wind in their sails and new strength. This match looked completely different from the 72nd minute. I like how one goal can change the morale of the whole team.