There's a lot more film shot than we see. It wouldn't suprise me to find out that Dave was on the verge of slapping Cody around just prior to his "excursion". He (Dave) didn't seem too accepting of Cody's new age survivalism and there was likely a lot of friction we didn't see. Sometimes getting up and leaving is the smart thing to do - even in the dark (with a camera crew, gps etc).just got down to the core of stupidity your going out into the darkness with a torch made from leaves ...
That said, they can both teach me something so I'll keep watching. Though I would likely come out more on the Dave side, I can't believe he doesn't like clams.