1) It's called Space-Time Ninjutsu (Jikukan Ninjutsu)Nah Noto, didn't you read the chapter where Obito and Sakura saved Sasuke? Sasuke swapped places with Sakuras jacket that is how it works he can only swapmwith inanimate objects, and that case there was a lot of rubble to swap with
2) Sasuke's ability works by swapping with anything, including just a physical space.
3) When you move through space, it takes time to do so. As Wolfus noted, teleporting involves creating a fold to make the distance from A to B close to 0, so close that the time it takes to travel from A to B is what we commonly refer to as instant but in actual fact, it's just a very, very small amount of time.
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