He struggled and was bit shocked of the high level, but he was mainly subbed because of the yellow IMO. Would probably stayed on otherwise me thinks. But you don't want an eager to please youngster on a yellow, vs highly skilled dribblers and divers.
And Paredes dictated tempo and Rabiot was given the task of hunting down Neymar lol, so both couldn't be subbed.
But if he didn't have a yellow, he would probably rebounded 2nd half because we actually had the ball then and played something resembling football. Instead of the Handball style bunker defence.