1) From the outside, you wouldn't see anything, because that matter is already emitting maybe one enormous radio wave-sized photon per year. But from the view

1) From the outside, you wouldn't see anything, because that matter is already emitting maybe one enormous radio wave-sized photon per year. But from the view of someone falling in, you might get an imperceptible jump like you had gotten slightly closer. Remember, if you dropped something Earth-massed into a black hole (say on the other side), the black hole wouldn't grow even a full centimeter in radius. This would be very difficult to notice in practice. "Kind of a "stutter" as you approach, maybe. 2) No. What's physically possible is the ridiculousness of a neutron star's core. If you surrounded an event horizon with something of that density with the snap of your fingers (say one hemisphere), well, just as suddenly you would have a local amount of mass that would be quite formidable and the event horizon would seamlessly expand in that direction. You wouldn't see it, just watch your half-neutron-star shell wink out as you have "too great" a concentration of mass in a particular volume. See #1.