PERSON WAS TRAMMING MIUNER WITH REMOTE CONTROL (BACKING MACH8NE OUT OF CUT). THE BOLTER WAS BEHIND PERSON BACKING UP. THE HEAD OF THE BOLTING MACHINE CAUGHT A SECTION OF WIRE MONSTER MAT THAT WAS HANGING ON RIB. WHEN THE MAT BROKE FREE, IT HIT PERSON IN THE CHIN CAUSING LACERATION THAT REQUIRED SUTURES.