EE WAS CARRYING A COME ALONG ON HIS SHOULDER HE HAD RETRIEVED FROM THE BACK OF A SPICK UP TRUCK. HE WALKED AROUND THE BACK OF A BOOM TRUCK AND DID NOT SEE A PIECE OF 3""X3"" ANGLE LYING ON THE G ROUND. HE STEPPED ON THE ANGLE, WHICH CAUSED HIMTO SLIP AND FALL, STRAINING HIS LOWER BACK.