EE WAS MOVING THE WALKER SHIELD ON LONGWALL RECOVERY FROM THE CONTROLS OF THE OTHER WALKER WHEN THE RIB ROLLED OUT & LANDED ON HIS FOOT. CAUSE OF THIS INJURY WAS SAFETY AWARENESS OF SURROUNDIN G CONDITIONS. COMPLIANCE WITH RULES/REGS WAS A FACTOR, SAFETY EQUIPMENT WAS NOT A FACTOR, MINER PROFICIENCY A FACTOR, MINING EQUIPMENT/SYSTEMS COULD BE A FACTOR.