Under the circumstances, we had a pretty good first half. More pace in the play than last game. Had some nice one-touch play. Even saw a few triangles. Coutinho facilitates so much.
After the goal, I think it was stamina more than tactical decisions that made us step off the gas and let them into the game. Pique, Suarez, Messi, Busquets, Rakitic all looked dead tired. That's simply not good enough and that's on Valverde. Winning in the CL is close to impossible if you are significantly inferior on stamina.