Gene -   
      
   Just a quick follow-up;   
   Naively I would imagine that in advance of the formation of the   
   event horizon at r_s, escape velocity v_e < c, so separation and   
   escape would be in no small part a function of the relative   
   momenta of the particle pair at the time of creation.  Given the   
   proximity to this surface, as you specify it,  the escaping particle   
   would need to be endowed with a quite substantial momentum   
   and be oriented on an appropriately outward pointing trajectory   
   in order to get free, while the partner (presumably slightly closer   
   to the surface and oriented differently) would likely get trapped.   
      
   I don't see any obvious way for there to be sufficient separation   
   of the pair to allow for escape/in-fall, except, as suggested in SH's   
   blog post, that the pair creation be located at some significant   
   distance from the collapsing mass.  I don't know what rule(s) would   
   allow a (massive) particle to be spontaneously created with sufficient   
   velocity to do the trick.   
      
   Cheers,   
   mark   
      
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