Let us suppose that we one black hole (BH) rotate around sun. Sun suddenly dissapear and some time after this this black hole start to move in line. (I am interested in answer in common interpretation of general relativity, where speed of gravity is c.) The problem is when gravity (stop) signal reach black hole, because space before and after its horizon is streched. Probably the same question is, when sun-ray reach black hole and move it? I please for answers.