He SOUNDS cold and calculating, and in my opinion, he LOOKS that way as well. Just my feelings.
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I think he was cold and calculating. I think his body language was calculated, he intentionally tried to look like a non-threatening guy who was just walking. Nobody for the girls to pay any attention to. He probably just walked behind them for a while and seemed to not care that they were there. He would walk near them for a while to make sure they were all actually alone and probably to wait until they were near the end of the bridge so they were easier to control and, again, he could be sure they were alone out there.
His voice was cold, calculating and calm. He obviously has good self control. He didn't ambush the girls. He seemed to assess the situation and spent time observing them before making his move. When he made his move, he didn't lose his head. He controlled the situation, he didn't yell, which would have alerted anyone in the area. He calmly but firmly ordered them down the hill. He waited until he was in a secure location, which he had probably scoped out, to finally do as he pleased.
I am wondering about how he got two smart and athletic girls to do as he said though. We know Liberty recorded him so I have to wonder if he harmed Abby and then used her as bait to get Liberty under his control. It's an awful thought but I don't see Liberty following his orders for any other reason.