Because the portal is moving them through it
Like how you would move through a hoop if it passed through you, it’s just a door through space
Do we agree that the massive block with the blue portal is not moving? So, imagine we are standing right in front of it when it happens - what happens exactly? How do the people appear?
Yes the blue portal isn’t moving
The people appear because the orange portal is moving towards them, the people then, like through a moving door, just pop out the other side.
It’s a door way through space, not a momentum giving portal.
Can you not see the orange portal moving? They don’t jump through it, this carrying their own momentum through. They are stationary through it so coming out they will also be stationary