Hung in the desert

Phil and Riot are left lying in the desert while traveling from Olmito to Austin, where they wait for another assignment. They have to walk to a gas station to fill up the car, but when they get there, they find something that is out of this world. The dude that comes out of the gas station turns into a demon in front of their very eyes and during a fight, the gas suppliers explode exposing a passageway that leads to a cavern. When they decide to explore it, they find the gas station demon’s family and something out of Lovecraft’s nightmares.