So I turned off the field cam, but added the macro invocation to the other
camera definition.

Then I made an axes object, made an object {axes transform {NoFall}}
and overlayed them.

There's no difference if they are at the origin, but when the axes are
translated up (by 50) before applying the transform, I indeed get the up and
forward behaviour.

I can fix the forward movement, but the vertical movement is really puzzling.

  #declare NoFall =
  transform {
   matrix <     1,     0,      0,
           ShearX,  VCorr, ShearZ,
                0,     0,      1,
                0,     0,      -50*ShearZ>
  }

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