- A traveller can only travel through time, not space. If he/she is at location A (in 2021) and wants to travel to location B (in 1989) the traveller must move to location B in the present (2021) and then travel to the past (1989).
- A traveller cannot travel to the future from his/her original timeline’s present.
- A traveller (in the past) can only “future” travel to his previous origin. Examples:
- Present-day is 2021. A traveller has travelled to the past, 1989. He/she can only return to 2021 (present-day)
- Present-day is 2021. A traveller has travelled to the past, 1989. He/she wants to travel to 2005. He has to return to 2021 (present-day) and then travel to 2005
- Present-day is 2021. A traveller has travelled to the past, 1989. He/she then travels further in the past to 1975. If he/she wants to return to 2021 (present-day), he has to travel from 1975 to 1989 and then 1989 to 2021
