Sure, you know the first leg is always more important than the second leg and now that barcelona have succeeded in wining them with 4 goals. The possibility for them to win back with this goal margin is something anyone can not think nor imagine that it will happen due to how consistant barcelona is towards chasing this champions league title, so I don't think if there's still a hope for dortmund.
It is quite possible to say there is no hope for Dortmund because I am also sure that Dortmund will not be able to score more goals in the second leg even though the match is held at their home ground. Because losing by four goals yesterday at Barcelona's home ground has made Dortmund's steps even harder to qualify for the next round in this season's Champions League and I am really not surprised by the result because Dortmund has not been good this season.
The first leg match needs to be obtained so that it can be more calm is true because if you win the first leg in the second leg we can be more confident in playing and or can do the defensive game to keep the firmness in the first leg, we just look at whether bakerlona will do the stratregi as you or use the same strategy in the second leg later, with the difference that is quite a lot I think they will do the strategy they used to win and get more goals Barcelona at this time.
Meanwhile Real Madrid had to pursue 3 goals because yesterday lost by Arsenal in his first leg.