Look at the history.  Someone came in and took out the entire buywall in one epic sell.  We're talking a couple hundred thousand coins in microsecond increments.  It is one seller and that seller sold all the way from about 1000 down to 500, and the next highest bid happened to be 121, even while the sell wall was at about 1100 the whole time.  Then that buyer sat there at 121 for ten minutes thinking money would fall from the sky.

Then they went to bittrex and did something similar.