I don't really think if Real Madrid can be able to comeback in the second leg. Because the three goals margin can never be that easy for Real Madrid to level without Arsenal scoring more goals in the game. The three goals defeat is a very big advantage to Arsenal because they are more balance right now in this second leg than Real Madrid, all they just need now is to only hold Real Madrid draw in this game.
Holding Real Madrid to a draw at Real Madrid's headquarters will also not be easy for Arsenal, especially if in the first leg Arsenal only benefited from two free kicks that were quite dangerous and indeed very deadly from Rice. As for the second leg which will take place at Real Madrid's home ground, I don't think the result will be a draw because there Real Madrid players will definitely use different tactics and there will also be encouragement from their own spectators so that their mentality will also be stronger to be able to win in the second leg. Just to equalize the position by three goals can indeed be quite difficult for Madrid, but Arsenal must not make fatal mistakes in the second leg because that could change Arsenal's condition for the worse.