I don't disagree with you, but I think you guys are making him more "concerned" than I think he was.
First, why would he not drag her through anything difficult. He certainly wasn't worried about
her getting caught on anything, that wouldn't have been a concern. Scratches? Big deal. He wasn't expecting to get caught. Someone's already brought up the possibility of a scratch on his chin. As rough and tumble and outdoorsy as he is, he could play off any scratches to football, fishing, hiking, camping. I can't go camping or hiking without getting scratches. Heck, I can hardly get through a day without getting some sort of injury!
I don't think the woods would slow him down as much as you guys seem to think they would. I don't want them ruled out because it would be more difficult or he might become entangled or stumble or scratched. I honestly don't think he cared about any of that, nor do I think they would have been overwhelming obstacles to him, preventing him from putting her somewhere where "no one would ever go" and where he would risk her being found. But I don't mean machete-thick underbrush; I mean the "typical" woods here - trees.