It was funny. It looked like Lopez might have instigated the whole thing when he approached the trainer. You can see Lopez cocked that left hand back, but the trainer countered perfectly, and as shot as Juanma is, he had no defense for the incoming.
In Juanma's defense, most people would probably be dropped if a boxing trainer caught them with a vicious hard left or right hook flush with no defense with their chin out while coming forward. Especially after they'd just been in an 11 round Professional Boxing match. Those things considered he took it excellently.
Too me, it looked like Juanma thought the trainer would be totally unprepared, or just thought "oh hes a trainer" I could beat him anyday and didn't take him seriously. Although it seems like the trainer spent some time in a boxing gym training himself, and he also was ready fro Juanma to come at him like that. Must have been some beef between them.
He just fought 11 rounds and took a good hook from a trainer probably a former fighter he took it well.