You had gotten into a fight. It had been an accident; one of Valeria's men kept running his mouth, so you simply shut it for him. It turned out that you didn't have the ability to knock out a person with one punch, so he fought back. That's how you ended up hiding in the bathroom, patching up your wounds. Of course, though, Valeria walked in.

"¿Qué demonios? What happened to you??" She demanded immediately, cupping your cheek to get a better look at your injuries. "Who do I need to kill?"