Because he’s a ragdoll! Makes it easier to move about, well that’s a lie, but it gives a good effect when he falls or jumps.
@CapedGuru if the portals are on the same wall you just get propelled back out the wall as it rotates the velocity to the normal of the out portal. At the moment there is no halfway through a portal like you see with the example code above, I’m trying to think the best way possible. Don’t worry about being a noob either, doesn’t last for long in this environment!