First, that there are no attraction forces in the universe.
2e: the Higgs field ( called Axion Higgs particle based field) has no mass only oscillating energy ( Casimir effect)
3e: gravitons and all other Photons and Gluons are Axion Higgs particles transformed by collision with spinning propeller shaped Fermions or Bosons..
4e: The New Black Hole is a compressed but resiliant Axion-Higgs field particle nucleus.
5e: Stable Black holes do not produce gravitons but produce fermion pairs at a small globular horizon leading to real plasma, which is negative charged from the outside.
Conclusion Gravitons do not escape form the black hole.!!!
Only Space itself does the gravity job for black hole surfaces..
Also called emergent gravity: http://vixra.org/pdf/1710.0050v1.pdf
For Fermionic matter like (Neutron) stars Gravitons are assumed to push back as a balancing element between two pressure fields..
see also: https://bigbang-entanglement.blogspot.nl/
As a consequence, stable growing Black Hole nuclei are resilient Axion Higgs Quantum Knots, which give balancing recoil to the outside pressure of the oscillating dark energy based Axion Higgs vacuum field.