Yeah, I agree; now in second leg they could be on advantage, and they need to be aggressive because if they will go for the defensive strategy then surely things can go against them, and they can lose their game with also can eliminate as well because in first leg they are already winner, and they need to be positive for the win or draw which will give them good chance but if having strategy just for the defense then surely things can go against them, and they could be on back foot with Arsenal having good attack and while playing at home they could be much better and confident for the big win which will allow them to have spot into round of 8.
Arsenal has a good attack, but for some reason they were unable to make a single shot on target in the Porto goal in the first match, so a big role in this match was played not only by a good attack, which could not create anything, but rather by the excellent defense of the hosts, which completely blocked all possibilities for attacking the guests. The second leg will be different, Arsenal will need to attack and Porto will definitely spend more time defending.