  We present a classical analysis on the issue of vector superluminality in the
decoupling limit ghost-free massive gravity with a Minkowski reference metric.
We show explicitly in the Lorenz gauge that the theory is free of superluminal
vector excitations around a nontrivial solution at the cubic order in the
fields. In the same gauge, we demonstrate that superluminal vector modes arise
at the quartic order and compute some superluminal propagating solutions. We
then generalize our findings to all orders in a gauge-independent way. We check
the physical consistency of the vector superluminalities, arguing that they are
not physically detectable in the perturbation theory but could be trusted
classically in the strong coupling region. Nevertheless, these
superluminalities involve only low frequency group and phase velocities and are
unable to determine the acausality of the theory.
