Captain Ford

Is there a separate darkwalker for each region? Or is there something wrong with the way the cinder hills coal mine is oriented with respect to Pleasant Valley? I'm currently trapped at the Pleasant Valley side of the Cinder Hills Coal Mine. If I move into Pleasant Valley from the coal mine, it takes me closer to the Darkwalker. If I enter the mine and travel deeper into it, it also takes me closer to the Darkwalker. This didn't happen at the other end of the coal mine (although somehow the darkwalker beat me to the other side, and I was able to get away from it by heading back through the coal mine in the other direction). I'm just very confused right now about how the darkwalker works with respect to changing maps. I captured a short video of what I'm seeing.