After Roger is sold to the Mohawk by Young Ian, he comes across a buzzing in the woods and finds a clearing with a standing stones much like Craigh na Dun. When he is freed from the Mohawk’s Roger returns to the stones but can’t bring himself to go through without Brianna.
When Roger and Bree decides to return to the future, they go to the stones Roger came across when traveling with the Mohawk. Something goes wrong and the trio is left in the past.