It depends on the size of the black hole and the worm hole. If the worm hole is real big compared to the event horizon of the black hole, the black hole will probably just behave as though, in its own proper frame of reference, it is moving through an unusually strong gravitational field. If the worm hole and black hole are comparable in size, I haven't the slightest idea because this must be one of those ugly problems in general relativity that require a supercomputer to work out. If the worm hole is much smaller than the black hole, I suspect the worm hole falls through the black hole event horizon, some small re-adjustment of the local black hole space-time occurs producing a gravitational radiation pulse, and the rest is hidden from view by outside observers...so it doesnt matter to us!

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