  The holographic conjecture for black holes localized on a 3-brane in
Randall-Sundrum braneworld models RS2 predicts the existence of a classical 5D
time dependent solution dual to a 4D evaporating black hole. After briefly
reviewing recent criticism and presenting some difficulties in the holographic
interpretation of the Gregory-Laflamme instability, we simulate some basic
features of such a solution by studying null geodesics of the Schwarzschild
black string, in particular those propagating nontrivially in the bulk, and
using holographic arguments.
