Under that theory. The star overhead would be “above” the star lower on the horizon. It’s simply your relative view point to space. What matters is how far away from earths surface the two relative objects are. Not there positions. I hope that makes sense.
I was referring more to what I thought may be the “tail” of this object as an indication of which direction it is going. But it is indeed relative to where he’s standing and indeed to what is “up” vs. “down”, which is too simplistic a viewpoint in end.
and your fixed point of observation vs the rockets fixed angle of incline that create that effect (it’s been way to long and I’m reasoning this out). It strikes me as a variant of the shadow observation proof used to prove that the earth was not flat. (Oh those ancient Greeks!!)