The big win that Real Madrid got seemed to send a signal to Barcelona, that they were in combat-ready condition to play at Camp Nou in the second leg. This win is also a big motivation for Real Madrid to face Barcelona and I think this will be quite a challenging El Clasico.
Regardless of who won the match with a lot of goals or few goals, in fact these two teams are both ready to continue the final battle to qualify for the Copa Del Rey final.
It's true that both of them are in good form, but I think Xavi has a good plan to avoid defeat in the semi-final second leg. At least Xavi expected draw for qualified to final, but I think win can also be expected. Now Frank Kessie will be heavily marked instead of another player.
But in this case I have a little hope for Madrid because this is the only way for them not to give another title to Barcelona after the super copa and La Liga which has been in Barcelona's hands.
Now Aggregate is still good enough for Madrid to attack, it's just that they need performance like the match against Valladolid to continue their dream of being in the Copa del Rey final.