Real Madrid arrived at La Cartuja in Seville unbeaten and left with the first defeat of Jose Mourinho's second spell in charge. Real Betis won 1-0, and the manner of it should interest any American coach who watches this team on weekends. Madrid have looked ruthless at the Santiago Bernabeu and a good deal less convincing away from home, and this was the game where that gap finally cost them points.

The moment everyone will remember is the penalty. Betis goalkeeper Adrian Valles had done his homework on Kylian Mbappe, and he said afterward he was clear on which way he would dive if Mbappe was the one to take it. He guessed right and kept it out. That is not luck. That is a goalkeeper who studied a specific striker's tendencies and committed to the read, which is exactly the kind of preparation you can teach a young keeper long before the pressure of a real spot kick.

There was controversy around the penalty too. Betis defender Marc Bartra was accused of encroaching into the box early, and former referee Xavier Estrada Fernandez argued publicly that the kick should have been retaken under the letter of the law. Officials on the day did not order a retake. For your purposes the lesson is simpler than the argument: everyone on the field, attackers and defenders alike, has to know the encroachment rule cold, because it decides whether a miss stands.

Betis also lost a man to a nasty injury. Center back Diego Llorente took a blow in a collision with Marc Roca, suffered a broken nose, and was replaced by Bartra inside the first 40 minutes. That put his availability for Betis's Champions League opener at Lille in doubt. Losing a starting center back mid-half is the sort of thing that reshapes a game plan on the fly, and how a team reorganizes in that moment is worth studying with your own back line.

On the Madrid side the injury news was Marc Cucurella, who came off late with cramp and is a doubt for the midweek meeting with Inter Milan. Cucurella has effectively taken the left-back job from Alvaro Carreras in these early weeks, which is a reminder that depth charts move fast when someone seizes a chance. Nothing on a preseason roster is permanent, and your players should hear that.

Manuel Pellegrini, the Betis manager, made a point of his team's resilience, noting that his sides rarely string two poor results together. That is a culture point more than a tactics point. Teams that bounce back reliably are usually teams that treat a loss as information rather than identity, and that mindset is built in training long before the season starts.

There was also a subplot in the stands. Dani Ceballos, once a Madrid player, had been watching from the Bernabeu just days earlier and was celebrating on the Betis side when the winning goal went in. Football careers loop back on themselves, and the emotional charge of playing against a former club is real for players at every level, including your high schoolers who transfer between clubs.

The bigger analytical point for Madrid is the two-faced nature of this side. The version that dismantles opponents at home is not the version that showed up in Seville. Bridging that home-away gap is one of the hardest jobs in coaching, and it usually comes down to whether a team can impose its identity in a hostile building rather than reacting to the crowd and the venue. Watch how Mourinho addresses it over the next month, because it is the same problem you face every time your team plays a tough road fixture.