[rotorblade]

Since black-holes interact gravitationally with other particles, there must be a mediation of a graviton between them (assuming quantum properties of gravity). However, force mediation is different from a physical particle escaping one object than interacting with another (e.g. physical graviton escaping a BH, interacting with an other particle). That is why we have the concept of virtual particles [0]:

"[...] the electromagnetic repulsion or attraction between two charges—can be thought of as due to the exchange of many virtual photons between the charges."

so when the electromagnetic force mediation takes place, it exchanges virtual photons, and this is different from an object exchanging physical photons with another (which we would more think of as one object shining (if the photon is in the visible spectrum) on another).

How a virtual graviton would interact between BHs and other particles are up to any suggested theory for quantum gravity to explain.

[0] https://en.wikipedia.org/wiki/Virtual_particle

[Santosh83]

Thanks. That makes it somewhat clearer. Also including both links below as they are relevant to this misconception:

http://math.ucr.edu/home/baez/physics/Relativity/BlackHoles/... https://www.quora.com/in/If-both-the-photon-and-the-graviton...