  The dynamics of black hole horizons has recently been linked to that of
Carrollian fluids. This results in a dictionary between geometrical quantities
and those of a fluid with unusual properties due its underlying Carrollian
symmetries. In this work we explore this relation in dynamical settings with
the interest of shedding light on either side by relevant observations. In
particular: we discuss how the null surface where the Carrollian fluid evolves
is affected by its behavior; that the fluid's equilibration properties are tied
to teleological considerations; the connection of higher derivative
contributions as both source of energy and dissipation for the fluid and the
non-linear behavior of black holes. This latter point, connects with
discussions of non-linear modes in the relaxation to equilibrium of perturbed
black holes.
