  The Haldane-Shastry spin chain has a myriad of remarkable properties,
including Yangian symmetry and, for spin $1/2$, explicit highest-weight
eigenvectors featuring (the case $\alpha = 1/2$ of) Jack polynomials. This
stems from the spin-Calogero-Sutherland model, which reduces to Haldane-Shastry
in a special `freezing' limit.
  In this work we clarify various points that, to the best of our knowledge,
were missing in the literature. We have two main results. First, we show that
freezing the $\mathit{fermionic}$ spin-1/2 Calogero-Sutherland model naturally
accounts for the precise form of the Haldane-Shastry wave functions, including
the Vandermonde factor squared. Second, we use the fermionic framework to prove
the claim of Bernard-Gaudin-Haldane-Pasquier that the Yangian highest-weight
eigenvectors of the $SU(r)$-version of the Haldane-Shastry chain arise by
freezing $SU(r-1)$ spin-Calogero-Sutherland eigenvectors at $\alpha = 1/2$.
