well that's obvious, I don't know why it took so long for Rafinha and Arthur sub. Been calling that sub at the start of the 2nd half in the match game
Arthur had some shaky problems in the second half But I don't think he was the problem really.
Rafinha's problem was he despite being a good defensive player wasn't providing much on the ball. He looked a step behind offensively compared to the rest. It was easy for Real to just stick 5-6 Dudes in the Midfield to counter what he brought.
Just subbing off Arthur for Vidal wasn't really going to work yet. If anything it would have probably been a disaster since you lose a lot of control and forcing Rakitic and Busi into tough positions that they aren't comfortable with.
What helped fixed our problems was both the Semedo and Dembele subs. Semedo being subbed on allowed to push Roberto who was much better than Rafinha into the Midfield to help negate Real's advantage. Dembele with his pace and amount of space help exploit Real's weaknesses in the 3-5-2.
Valverde was basically playing a Chess match and when he finally made the killer move it was over For Real and in this case, the Semedo-Dembele subs were spot on which allowed us to get two more goals and brought on Vidal to basically close it out with a goal.