A quick response limits the time Onalaska firefighters spent battling the elements and a fire at a duplex Tuesday evening. The Onalaska Fire Department said the call to 403 Flint Court came in just before 7:30 p.m. and by 7:40--just 11 minutes later--the flames were extinguished. One person in the building at the time was taken for treatment by Tri-State Ambulance. No firefighters were injured. Three other departments--La Crosse, Holmen and Campbell--were standing by to assist. Investigators are still looking into what caused the fire.