It twists through a timeless time and floats down a spaceless space. Universes are where things make sense, and it travels outside them. But the space outside isn't not a place where momentum has meaning, because that would be simpler, and the chaos between realities is never simple.

So the gift has a certain amount of 'momentum' when it falls on another recipient, wrapping gently around their soul. And so they fall, entwined, and fetch up in a different place entirely.