The title is literal. The “battle in heaven” is the war within Marcos between monstrous animality and desperate, failing grace. The final scene—a gruesome, unexpected execution—is one of the most debated and viscerally powerful endings in 21st-century cinema.
Social class serves as a silent but suffocating backdrop to the film. The divide between Marcos’s world of cramped apartments and public transport and Ana’s world of luxury cars and high-rise views is absolute. Their sexual encounter is less about romance and more about a desperate attempt to bridge this divide through physical contact. For Marcos, Ana represents a gateway to a higher world; for Ana, Marcos is a conduit for a raw, unfiltered reality she cannot find in her own social circle. However, this bridge is ultimately unstable. The film suggests that in a society as fractured as Mexico’s, true connection across class lines is often mediated through violence or exploitation.