Suddenly'd

It's like teleportation but from the perspective of some guy who sees the teleporting person come out of nowhere.

When something comes out of nowhere, goes into nowhere, or anything else abruptly happens. It's most commonly explained by something like Plot Said So or S as the creators can't come up with a better explanation as to why something or someone got Suddenly'd. Suddenly'd can also work in reverse where an entity disappears into thin air and no one can find where it went.