Thinking that Madrid will be able to come back is like Thinking that Arsenal will not be playing in this game, I know anything is really possible in football but there are situations that when you look at critically and consider that which is involved you just understand and conclude that certain things are very likely not to happen such as this, Really Madrid need 4 goals to have a proper comeback enough to get them knocking Arsenal out and they need all four goals in one match but again Arsenal has got a better defence than Madrid does so I'm wondering how the magic will be done except if Arsenal gets to suffer red cards or have their key player injured which is almost not happening so it's an almost not possible task for Madrid but let's see, I will never say never because it's not over until it's actually over.
Real Madrid need to finish next quarter final with 3-0 scoreline to take the game to penalty shootouts. If Arsenal score one goal then Real Madrid has to score four goals to take the game to penalty shootouts. If Real Madrid directly want to qualify for semi finals without penalty shootouts then have to finish the scoreline 4-0. I don't think Arsenal will play that bad in next quarter final after giving there best in first leg. From my point of view, it will be worthy to place money on Arsenal for next leg then on Real Madrid.
This is when you can risk on Real Madrid to win, I doubt if Arsenal will be able to win Real in their home soil, Yes Arsenal did perform incredibly during their first leg of the quarter final game with Madrid, but I believe Madrid has gone back to their drawing table to fix things up to avoid such a humiliation to happen again, What caused Madrid their lost to Arsenal was basically that they underated Arsenal's capacity in that game and didn't prepare so well, so in this second leg encounter, I strongly believe that Real Madrid will win but Arsenal will qualify in the end because I doubt if Real Madrid will be able to score up to 3-4 goals without Arsenal scoring back even a single goal. Taking risk Madrid's side at this point make absolute sense on that match day.