Re: A partial black hole?

Tim Little wrote:
> On 2008-02-23, Mike Huskey <mikehsk@[EMAIL PROTECTED]
> wrote:

>>I would guess that anything that does escape would be quickly
>>recaptured.
> 
> If it could escape without locally exceeding the speed of
> light, it was by definition not within the event horizon.

A variation on Mike Huskey's theme:

What if a second black hole dropped toward a larger
first black hole, as close as it could come without being
captured. It seems like the passing of BH2 might
allow something that previously was inside BH1's event horizon
to "hitch a ride" outside the EH.

This seems right because the canceling of gravitational
force seems like it should cause the event horizon to recede,
at least somewhat.

My opinion is very much non-mathematical, though. Is
there some theorem that says "once your worldline
crosses an event horizon, it won't cross back"?

I realize this is more-or-less the /definition/
of an event horizon, but I take those definitions
to be about simple situations, single blobs, static
or spinning or charged, or so on. But how I take it
could be different from how it is.

Jim Burns