So when enough matter to create a black hole falls towards the center of its collective mass, at one point the mass/area ratio becomes high enough to form the event horizon of the black hole. Because this would yield a sphere rather than a point, it has volume and because the event horizon can't fall any further inside the black hole (since for matter just inside the event horizon, time would have stopped), that would make the event horizon an impenetrable shell.
Now the stuff at the exact center of the black hole would experience the same pull towards every direction and thus would still be able to travel through time and space, right? In that case, it would travel along the shortest path towards the event horizon (since its ulikely to be at the exact center, until the pull gets strong enough to stop time for that matter as well.
By that reasoning, all black holes should be hollow, right?
And now the mind bending bit - after the big rip, when space is expanding faster than the speed of light, it should also do so inside black holes. Does that mean that black holes will be expanding at the speed of light? Up until the point where the mass density gets low enough for it not to be a black hole anymore?