Still don't understand Arsenal, why in PL they can't win twice while in CL they can beat big teams with a landslide score, but this is football sometimes full of surprises.
They know that the EPL is already over, Liverpool are going to be champions. The CL is Arsenal's only hope of a trophy this season, so they are mentally switched on for CL, it is normal. Arsenal are very close to the SF of the CL, which would be a huge achievement for them, i think the most important thing for them in the second leg is to ensure that Real Madrid do not get an early goal, if they do, the Bernabeu will go crazy and Arsenal might be unable to handle the pressure.