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I think the gist of this question is can a 'blackhole act a gravity shield', I do not think so if gravity is mediated by Gravitons they are extremely light and penetrative and will pass thru a stellar sized blackhole
There is absolutely no such thing as a black hole eclipse consider what happens to light if a black hole passed between you and the star. the star would not disappear it would vary in brightness and get even brighter for a while because the gravity of the black hole(or any other object) bends the light round it and acts a bit like a lens. a similar thing would happen with gravitons from the gravitational field. This gravitational lensing effect with light is being used to detect small isolated planet sized bodies at great distances.