EE WAS ASSIGNED TO SUPERVACUUM FLOOR DRY FROM THE KILN FINISH TOWER. DURING THE COURSE OF VACUUMING THE HOSE LINE PLUGGED. THE PRODUCTION SUPERINTENDENT NOTICED THIS AND WENT TO GIVE ADVICE ON HOW TO PREVENT. IT WAS NOTICED THAT THE HOSE WAS TWISTED SO THEY BOTH WORKED TOGETHER TO STRAIGHTEN OUT HOSE AND HE WALKED OFF ROOF BACKWARDS.