Roof fall on the 002 section # 3 heading while getting first lift of the pillar block. Roof fall came from the pillar line, directly behind catching the #1 MRS as it was set up for roof protection. The approx. size of the fall was Length-30' width- 20' height- 5.5'. MRS system worked to catch falling roof and was retrieved after order was terminated to allow removal of MRS.