Quote from ofthomas:
simple, someone sold into the bid... in order for 52 to go bid, 1533+ contracts have to be bought (assuming no icebergs selling at that level)...
Ok let's make it easier by using an image:
The ES is currently trading at 1553.75. There are 785 contracts waiting to be traded at this level. Why does price go away from this level before that 785 becomes a 0?