Why even attempt to take two girls at one time? How does one have total control over two people? Even with a gun, there must have been some time that he was preoccupied with one "hostage" (for lack of a better word) that may leave time for the second to run, scream, attack him. Did he tie or handcuff them together? Were their mouths covered to stifle screams? For some unknown reason, I don't feel this was a sexually motivated crime.
But another scenario I have contemplated is that the girls encountered someone they knew, even if not too well. Perhaps they asked to use a bathroom, or wandered over to look at the horses. Maybe they were offered hot chocolate or something along that line. Once the suspect had them inside (home, barn, shed?) he became stern and threatening, and then ...... ?
I don't believe we have heard any confirmation of dragging bodies to the spot where they were found. However, they could have been moved by ATV, horse, trailer, etc.
No matter how this all came about, I cannot for the life of me come up with a motive for killing tow young teens.
You probably can't come up with a motive because you are a good person. We discussed several threads ago that to control both girls you only need to control one because they would never leave a friend behind, even if that was the only chance either of them had to survive. JMO but the timeline is too tight for these girls to have been murdered in a space of 45 minutes out in the open in broad daylight...I believe they were taken to someone's home and the bodies were transferred in the middle of the night after the search was called off... really horrifying.