Pep made a mistake by putting in a more defensive midfield, by using Fernando and Fernandinho at the same time. Very much unlike Pep this first half. Instead of trying to dominate the midfield by putting in Gundogan, he's made it too much end-to-end, and Tottenham trhive on this kind of football.
I've rarely seen him going defensive, with a 4-2-3-1 in which the two midfielders are both defensive minded, without playmaking skills. It's as if we're seeing two teams that are the mirror image of each other, only one is performing at a much better degree. Fernando - Fernandinho isn't much more creative than Tottenham's midfielders, Wanyama and Sissoko, if at all.