>>718654064
It's not the same as dropping a room because in the "room drop" scenario, the exit side is moving. In the portal scenario, the exit side is stationary. The cube exiting it has upward momentum since it's traveling upward from a stationary surface. Then it magically stops somehow, according to Afags.

>>716504658
>Basically having the pov of the Cube.
There is one like this
Of course it's no longer the reference frame of the portals, it's now the reference frame of the cube.