>>716483356
Let’s walk through it then. If you want to (for whatever reason) treat the entrance and exit of a hoop as though they are separate things, you’ll find they behave much like two portals on opposite sides of a thin panel. In this situation, a box enters one end with some velocity relative to the entrance and leaves with the same velocity relative to the exit. In this situation, we see the same outcome.
However, portals allow for the entrance and exit portals to be oriented and move differently unlike a hoop. It’s how you can fall down off a ledge in the game and end up with horizontal or upward momentum.