frankly this kind of situation calls for a miracle, in the form of H-A (Home-Away).
definitely i did not expect sevilla to be that articulate in their home ground, it surely woke the arsenal team up after scoring an early goal, then to get 4 shots on target and converting two of them. arsenal's goalpost never seemed like such an easy target as before.
sevilla has started to slow down their pace a little, and arsenal needs to grab this window to equalise before sevilla goes into all-out defending. and yes, they better orientate themselves on the field fast by start of second half before they gets eaten inside out.
and arsenal has not challenged their opponent's goal, with only 2 shots on target and a corner kick given away because the ball was not sent into the box. if sevilla players are moving fast, i think it's time to employ a bit of long ball and not dribble here and there.