Assume a spherical region of breathable air just under the density needed to form a low density supermassive black hole. Two people float 20 feet apart from each other exchanging small talk. As gravity does its work, the spherical region holding the person closer to the center reaches the density needed to form a BH. Does the person just outside the just formed event horizon simply see the other person disappear instantly? Before this happens does the further-from-the-center person see a large red shift of the person only 20 feet away. What happens when the other person passes through the event horizon, can he see his friend again? NOTE: I'm working under the assumption that for supermassive black holes small regions of space won't have extreme curvature and things should appear relatively normal within such a small region.