WHILE USING THE HI-VAC HOSE TO VACUUM UP THE SPILLED CEMENT, THE 8"" STOPPED WORKING. EE STARTED TO PICK UP THE BROKEN HOSE, WHEN HIS RIGHT HAND WAS SUCKED INTO THE HOSE. WHILE TRYING TO GET HI S ARM OUT OF THE HOSE, MACHINE WAS TURNED OFF. EE LOOKED AT HIS ARM AND BECAME DIZZY. HE FELL BACKWARDS HITTING HIS HEAD ON 1104 SCREW. EE BLACKED OUT FOR 1-2 SECONDS.