Maerry
I think it'sbetter if there's some kind of twist here as well like the ley line incident. Back then two set of people from two different timeline goes to the same past timeline. This time it might be nice to see something like "there's two version of destination, so there's two copy of the same person in each version" so when they come back to their original time the two copy merged back together so they have two sets of memories of going back to the past. Just for the sake of comparisson purpose.