I think Flick had the same idea I mentioned before the game: Madrid's biggest, and arguably only reliable, weapon to hurt us is through transitions. So we needed to slow the tempo, avoid rushing our decisions and treat every lost ball as a potential counterattack. But that approach ultimately came back to haunt us. No team can control a game through possession for 90 minutes, and no matter how much of the ball you have, you still need a minimum level of defensive solidity when you lose it. We simply didn't have that. Even when we keep the ball for like 10 minutes, it still felt like the moment we loose it, they were just one pass away from getting through on goal. The result was the worst of both worlds. By slowing the tempo, we sacrificed the attacking threat that usually makes us so dangerous, but we still couldn't prevent Madrid from exploiting us defensively. We gave up a part of our attacking identity in exchange for greater defensive security, yet we never actually gained that security.