[3] After a secret military base ceases all communications, an anti-guerrilla commando unit is sent to the mountainous location to discover what exactly happened.

The squad expects to discover that the base was attacked and taken over by guerrilla units, but instead find only a lone woman (Daniela Catz) wrapped in chains.

A team of anti-guerilla commandos led by an experienced sergeant and commanded by a green lieutenant are sent to secure the approach to a mountain base amid towering radio masts.

Exploring the base, their local guide (Fiquitiva, nicknamed "Indian") discovers a room filled with fetishes and prayers scrawled on the walls.

Reading the papers Cortez discovers that the woman was picked up on suspicion of being a guerilla spy and interrogated, but refused to talk.

Ponce has a flashback dream to hazy memories of an event before the start of the mission, but is suddenly awoken by shouting from his radio to return to the guard post.

The mist means that they cannot see anything, but corporal Cortez defies the lieutenant to lead the men out to attempt to kill the "guerrilla bitch".

The lieutenant, furious at Arango's death and the squad for disobeying his orders, attempts to relieve Parra's friend of his weapon, but is stopped by the corporal, who accuses him of knowing about the witch from the logbook all along.

Indian, who has been furiously scratching since falling in the pit, goes to the medic and demands treatment for "the plague" he has caught from the dead bodies.

In a rage, the medic reveals that he killed the sergeant rather than let him rape and murder another woman, referencing the events from Ponce's flashback.

Ponce climbs slowly down the mountain, suffering flashbacks to the events before the mission - the massacre of an entire village of guerrilla sympathisers.