Arsenal just need to score goals in the next leg, it doesn't matter how many Barc score so long as its no more than 1 more goals than we score. 2-3, 3-4, or even 4-5 to Barcelona still means we go through. Barcelona are in a tricky position because they know they need to score but they also realise the danger of conceding goals. Barcelona need to sustain a strong attack and defence. Arsenal just need to get goals in.