[bencyoung]

Thanks! Hmm, I think we're talking about slightly different things but it's been too long since I studied it to put it in the right words :)

I completely agree that spacetime can be "flatish" for a large block hole, but the event horizon does still represent a boundary right?

Consider the edge case of crossing the event horizon itself at some speed <<c (because you've got magic thrusters fighting the pull). At some point your feet will be through the event horizon and your head won't be. Do you agree that at that point you won't be able to see your feet?

I agree that your head will pass through the future light cone of your feet, and so could do somethign to affect your head (by emitting something falling slower than your head), but I'm not sure any light rays could follow that path.

[bencyoung]

Ok I drilled down a bit and looks like you are right, although I'm still not sure I've built up a clear understanding! (https://physics.stackexchange.com/questions/187917/thought-e...). In fact that question (series of onions) is exactly how I visualised it...

I'm not quite sure from that discussion why an event horizon is equivalent to a body moving outwards at the speed of light but it does make some sense. GR is always fun!

I still don't have a good idea of the "slow moving crossing the event horizon" case" but I'll read around it some more

Maybe the difference is between "free fall through an event horizon" vs "hover" (as much as is possible) at an event horizon