I used to try to figure this stuff out too, but it's worse than trying to figure out devil fruit or anything else on the Grand Line.
They turned me into a kid once. More like... me as a kid if I'd been obsessed with being a knight. Anyway, they play with time a lot, so my best guess is they went back in time and manipulated it to suit their purposes.
[Written]
Magic?
I used to try to figure this stuff out too, but it's worse than trying to figure out devil fruit or anything else on the Grand Line.
They turned me into a kid once. More like... me as a kid if I'd been obsessed with being a knight. Anyway, they play with time a lot, so my best guess is they went back in time and manipulated it to suit their purposes.