>> and global markets watching what's happening there. many thanks to you. a wild and volatile day on wall street saw the dow lose 3.6%. its eighth biggest one-day point loss ever and the biggest since august 2011. [ bell ringing ] >> and yet, by the closing bell, there was almost a sigh of relief, because it could have been and was in fact a whole lot worse. veteran traders say they have never seen anything like this before. many analysts were at a loss for words. richard quest has never been at a loss for words. this was a dr. jekyll/mr. hyde day. it jumped into positive areas. but what is going on, richard? >> as i watch thed that rebound