Young couple goes on van tour of US, boy comes back with van - no girl

0rion said

I didn't really follow this very closely. Is it even possible it was a mercy killing like he said?

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Nope. IF she was that badly injured, you wait till she's so bad that you "have" to kill her instead of going for help? Oh, didn't want to leave her alone? Well, he wasn't much help being there either.