In a university classroom, students studying Spanish watched a film about the horrific murders of young women in Mexico. As the credits rolled, there was a knock at the door, the Associated Press reports. A police officer wanted to know: Where was Patricia Guardado? With the violent images from the movie still hanging in their minds, some of those in the class at the University of Arkansas at Little Rock feared the worst about the bright college sophomore. Their worries were confirmed Monday when police said Guardado’s body had been found in a pond outside Little Rock…