Just as they had reversed their direction, Edith Shipton passed them, driving down the mountain, not speeding but too fast by Dean's conservative standards.
We may imagine these changes reversed in two ways.
If Annie's abductor was still operating, that literally reversed the odds that we'd knock heads with him if he remained active!
He found himself hating the feeling instead of relishing it, like he thought he would if their roles were ever reversed.