Nobody said it’s teleporting the whole body. But that was my only explanation of how something can move without speed.
But great, that’s what I wanted to clarify the whole time. I think my explanations were too complicated, sorry.
So, taking your example:
When the portal falls on me - as soon as it reaches my neck. Only my head is coming out of the other portal, literally right above the ground. Correct?
As the portal keeps falling down, more and more of my body comes out of the other portal until my whole body is out of it. Correct?
Which leads to the fact that my head was moving from right above the ground to the height of my body. Correct?
So my head moves upwards. And since it takes time for my head to move upwards, we can measure the speed of my head moving upwards. Wouldn’t you agree?