El bar

A strange man walks into the restroom of a bar in Madrid. Without warning, two patrons are killed by a sniper when they exit. The streets are evacuated, leaving Elena, Nacho, Israel, Sergio, Amparo, Andrés, Trini, and Sátur trapped in the bar. As they argue, the stranger exits the bathroom, grotesquely diseased; before succumbing, he warns the others not to touch him. Trini panics and slips on the stairs, spilling some bottles, and Nacho notices the liquid does not pool on the floor: they discover a small, hidden sewer grate. Covering Israel in oil, they try to slip him through into the tunnel below only to become stuck. Upstairs, people can be heard storming the bar, gunning down Andrés, Amparo, and Sergio, before setting the building on fire. Freeing Israel, air from the sewer allows the remaining patrons to survive the smoke. Once it is safe, the group ventures upstairs into the gutted bar, finding it taped off and surrounded.