My gut feeling is that they most likely were infact killed pretty quickly, and that they weren't found right away bc they simply weren't searching in the right spot. It's my belief that they more than likely focused much of the early attention on the trail area and back towards town. JMO
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This is what I've always thought too. I don't think he took them anywhere & brought them back. I believe the area where they were found is as far as he took them and he probably didn't waste much time before he killed them. He wouldn't have any idea if other people might show up, so I can't see him taking his time and risk having the girls scream or anyone spotting him.
jmo