  The electrodynamic theory of continuous media is probably the most convenient
platform when trying to construct analog gravity theories. Quite naturally,
this topic has gained considerable interest. One peculiar but not so very known
feature in this context is the unconventional behavior of radiation energy and
momentum in cases where superluminal fluid velocities are encountered, what, as
known, is a major ingredient in analog gravity theories. These peculiar
features are intimately connected with the spacelike character of Minkowski's
four-momentum in electrodynamics. Here, we first consider an artificial model
in which a Kerr-induced superluminal region is created in the right-hand region
($z>0$) in a left-moving, originally subluminal, fluid. We analyze the behavior
of energy density, Poynting vector, and momentum density, and calculate the
force on the artificial black hole horizon. Also, we delve into quantal
aspects, looking for eventual production of particles associated with the
sudden creation of the horizon, finding, however, that no particles are
predicted to occur. The present paper continues a previous investigation by the
author on the same topic, in Phys. Rev. A {\bf 100}, 032109 (2019). The subject
as such is closely related to the famous Abraham-Minkowski problem.
