What happens when black holes collide? | EXPERT ANSWERS PHYSICS GIRL QUESTIONS

Great conversation! 
It is still not clear to me why we are able to get ANY information from the merger of 2 BH's. As one BH reaches the other's event horizon, shouldn't it slow to an eternal stop on the surface of that sphere relative to the rest of us observers outside? Why do we (the observers) experience the merger of BH's differently than we would the merger of a BH with an infalling spaceship?