  The Weak Gravity Conjecture requires that it be possible for all (classically
stable) extremal black holes to decay. The "black hole version" of the
conjecture requires that it should be possible for this to occur through the
emission of smaller black holes. We consider this version in the case of
extremal AdS$_4$-Kerr-Newman black holes which are stable against a
superradiant instability. One finds that the emitted black hole must be very
exotic, having a direction-dependent causal structure. This is independent of
the question as to whether the emitted black hole necessarily violates
classical Cosmic Censorship. When the system is embedded in string theory,
however, we find that it (probably) does.
