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Although we're solidly in the realm of fantasy thought experiment, it struck me that - in principal - if one was inside the black hole, with sufficient mass under your control, you could pass a signal to outside the hole by shifting the mass this way or that.
Obviously we're taking vanishingly small windows of time. But in principal it seems that you could react to something inside the horizon, exert your will on the movement of something super massive, and that be detectable to someone outside the horizon?
Wouldn't shifting the mass require pushing against another mass? In that case, might those two signals cancel each other out?