The black hole would absorb the antimatter like it would anything else.
Matter and antimatter are annihilated and converted to pure energy when equal masses of each are slammed into each other. This energy release cannot escape the event horizon of the black hole so the result of someone shooting antimatter into a black hole would be entirely unremarkable.
There is only one result for throwing anything into a black hole's event horizon: the black hole absorbs it and becomes bigger.
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The black hole would absorb the antimatter like it would anything else.
Matter and antimatter are annihilated and converted to pure energy when equal masses of each are slammed into each other. This energy release cannot escape the event horizon of the black hole so the result of someone shooting antimatter into a black hole would be entirely unremarkable.
There is only one result for throwing anything into a black hole's event horizon: the black hole absorbs it and becomes bigger.