(2-13) When Nefertiti puts the shot during her plane flight, and the distance thrown is measured:
the line between Nefertiti and the landing point is stationary in Nefertiti's own frame of reference, just as it was when she did it on the ground. So in her frame of reference, we should expect the distance to be the same.
When Nefertiti was on the ground and Cormorant was (we assume) stationary in his tree, the line between Nefertiti and the shot's landing point would have been stationary in both their frames of reference, so the distance measured would be identical.
When Nefertiti is on board the plane, however, Cormorant will be a moving observer of the athletic action. Therefore the distance thrown will be smaller in Cormorant's frame of reference, compared to the distance Nefertiti measures (and the distance Cormorant would have measured, when she was on the ground), due to relativistic length contraction.
He isn't going to mention this. Also, of course, bear in mind that if a tape measure was being used to measure the distance, the spacing of the marks on the measure would also be contracted, so in this case the numbers would still tally.