  The $J\to \infty$ double exchange model is formulated in terms of three
auxiliary particles. A slow true bosonic magnon propagates by admixture with a
fast fermionic pseudo-magnon. This process involves the absorption of a
conduction electron which, for this half-metal, carries only charge degrees of
freedom. The magnon dispersion becomes much weaker and the relaxation rate
increases rapidly upon approaching the zone boundary. That the magnons relax
for all wave vector values implies the existence of a low energy spin
continuum.
