Cats do crazy things sometimes. I called one years ago with a raccoon fight sound on a Foxpro. That was a loud, squalling sound like I had never heard. That cat came running in like his pants were on fire. When the caller stopped briefly, the cat instantly stopped and stood there, and when the sound resumed he once again ran toward the caller like he was possessed. I had always heard that cats lose interest quickly, so to keep the sound going. That was the case with this one, at least.