need to know
why did he Brolins character return to the cartel execution scene in the desert after he had the money. what were those mexicans doing in the motel when it was assumed Brolin chose a random motel to hide or lye low for a while.
sharea) Llewellyn probably felt sympathy for the dying man in the truck, thus the reason he filled up the milk carton with agua.
b) The cartel guys were in the bathroom because they also had a signal tracer and were trying to pinpoint the money's location. It was just at that moment that Anton walked in on them to finish them off, but I think if they had several more minutes they might have traced the signal to the air duct above the the bathroom.