INJURED STATED THAT HE WAS BACKING THE CRAWLER DOWN THE SIDE OF THE LO-LO STRUCTURE AND THE DOLLY HUNG ON THE STRUCTURE. HE ROLLED TO HIS RIGHT SIDE TO LOOK BACK AT THE DOLLY WITH HIS LEFT FOO T PARTIALLY IN THE DECK & PARTIALLY ON A MUCK PILE OUTSIDE THE DECK. HE THEN SAID HE HEARD THE FRONT CRAWLER OPERATOT SAY TO PULL BACK UP & BEFORE HE COULD GET HIS FOOT BACK IN, THE FRONT CRA