DIRT & ROCKS CAUSED THE RETURN ROLLER TO STOP. EE WAS USING A METAL BAR TO BREAK UP THE DIRT & ROCKS. AS THE MATERIAL BEGAN TO BREAK UP, IT SET THE BELT IN MOTION. THIS CAUSED THE BAR TO BE PULLED INTO THE ROLLER. EE HAD A TIGHT GRIP ON THE BAR & HIS FOREARM WAS CAUGHT IN BETWEEN THE BELT & THE ROLLER. EE WAS ABLE TO PULL HIS ARM FREE FROM THE BELT BY PULLING ON BICEP.