  The causal structure of the recent loop quantum gravity black hole collapse
model [1] is analysed. As the spacetime is only approximately diffeomorphism
invariant up to powers of $\hbar$, it is not straight forwardly possible to
find global conformally compactified coordinates and to construct the Penrose
diagram. Therefore, radial in- and outgoing light rays are studied to extract
the causal features and sketch a causal diagram. It was found that the eternal
metric [2], which is the vacuum solution of the collapse model, has a causal
horizon. However, in the collapsing case light rays travel through matter to
causally connect the regions in- and outside the horizon -- the causal horizon
is not present in the collapsing scenario. It is worked out that this is
related to the shock wave and spacetime discontinuity, which allows matter
travelling super-luminal along a space-like trajectory from the vacuum point of
view, but remaining time-like from the matter perspective. The final causal
diagram is a nice compact patch of a Reissner-Nordstr\"om causal diagram.
Further, possibilities of a continuous matter collapse with only time-like
evolution are studied. It was found that the time-reversed vacuum metric is
also a solution of the dynamical equations and a once continuously
differentiable matching of the vacuum spacetime across the minimal radius is
possible. This allows an everywhere continuous and time-like collapse process
at the cost of an infinite extended causal diagram. This solution is part of an
infinitely extended eternal black hole solution with a bounce, whose global
extension is constructed. Due to the analysis of radial light rays, it is
possible to sketch causal diagrams of these spacetimes.
