  The emergence of flagpole and flag-dipole singular spinor fields is explored,
in the context of fermionic sectors of fluid/gravity correspondence, arising
from the duality between the gravitino, in supergravity, and the phonino, in
supersymmetric hydrodynamics. Generalized black branes, whose particular case
consists of the AdS--Schwarzschild black brane, are regarded. The
correspondence between hydrodynamic transport coefficients, and the universal
absorption cross sections of the generalized black branes, is extended to
fermionic sectors, including supersound diffusion constants. A free parameter,
in the generalized black brane solution, is shown to control the flipping
between regular and singular fermionic solutions of the equations of motion for
the gravitino.
