Devin is driving through the desert in the middle of July... that part is pretty clear. It sounds like he's having hallucinations partially induced by the heat and dehydration but possibly also trying to determine how much truth there is to them as he describes an incident involving a room. There's possibly a third party involved. Maybe Devin and his accomplice tried to rob a chick but the other guy ended up killing or raping her, implicating Devy in far worse than simple robbery. Now he is panicking, trying to get away. Rain represents the force which washes all clean, and thus in his mind, the sin.
Devin is driving through the desert in the middle of July... that part is pretty clear. It sounds like he's having hallucinations partially induced by the heat and dehydration but possibly also trying to determine how much truth there is to them as he describes an incident involving a room. There's possibly a third party involved. Maybe Devin and his accomplice tried to rob a chick but the other guy ended up killing or raping her, implicating Devy in far worse than simple robbery. Now he is panicking, trying to get away. Rain represents the force which washes all clean, and thus in his mind, the sin.