Recently, my good buddy came home to a major flood in his mobile home, broken washing machine hose. Long story short, flooded ductwork and torn vapor barrier. A slow moving animal of indeterminate size has taken up residence between the barrier and the flooring above. Everynight he hears the sound of clawed feet scratching in an attempt to get into the duct. He asked me to help, I'm asking you guys for help. Any thoughts?