A thought experiment. C is considered to be a constant speed, that can not be exceeded. Once light passes the event horizon of a black hole however, the gravitational pull is strong enough to exceed, C. This is indicated by the supposition, that not even light can escape the event horizon of a black hole. So what about Exotic Matter? If a particle with negative mass were to somehow pass the event horizon of a black hole, would it not then be repelled from the black hole at a velocity greater then C?